My first drill bit set died in 20 minutes on a 1/4-inch steel plate. That’s the moment I started taking metal drill bits seriously. After burning through three bargain sets, I learned the hard way that picking the right set is the difference between clean holes and a pile of smoking metal shards.
I’ve spent the last three months testing ten of the most popular drill bit sets for metal — drilling through mild steel, stainless, cast iron, and aluminum with both cordless drills and a drill press. The picks below reflect what actually held up, what walked, and what burned out fast. Whether you need a budget set for occasional jobs or a pro-grade M42 cobalt set for daily fabrication work, this guide covers the best drill bit sets for metal in 2026.
One quick note before we start: cobalt vs titanium is a real choice you need to make. Cobalt drill bits are best for hardened steel and stainless, while titanium coated bits shine on mild steel, wood, and general purpose work. I break down when to choose each in the buying guide, and I call it out in every review below.
Table of Contents
Top 3 Picks at a Glance
Bosch CO14 14-Piece Cobalt Metal Drill…
- M42-grade cobalt construction
- Split-point tip eliminates walking
- 3-flat shank for no-slip grip
DEWALT DW1354 14-Piece Titanium Nitride Set
- Pilot Point tip starts on contact
- Titanium coating extends bit life
- Connectable storage case
DEWALT DW1361 21-Piece Titanium Nitride Set
- 29k+ reviews and 4.8 stars
- Pilot Point design
- Includes 1/16 to 1/2 inch sizes
Best Drill Bit Sets for Metal in 2026: Quick Overview
| Product | Specifications | Action |
|---|---|---|
 DEWALT DWA1181 21-Piece Black and Gold Oxide |
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| DEWALT DW1361 21-Piece Titanium Nitride Pilot Point |
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| DEWALT DW1354 14-Piece Titanium Nitride Pilot Point |
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 Bosch CO14B 14-Piece Cobalt M42 |
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 BOSCH CO21B 21-Piece Cobalt M42 |
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 DEWALT DWA1240 14-Piece Cobalt Alloy Steel |
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 DEWALT DW1369 29-Piece Titanium Nitride Pilot Point |
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 Makita B-65399 Impact Gold 14-Piece Titanium Hex Shank |
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 Drill America DWD29J-CO-PC 29-Piece M35 Cobalt |
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| Bosch CO14 14-Piece Cobalt Metal |
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1. DEWALT DWA1181 21-Piece Black and Gold Oxide Set – Best Overall HSS for Metal
DEWALT Drill Bit Set, 21 Pc High Speed Steel DEWALT Bits, Black and Gold Oxide Coated, 135 Degree Split Point, 31 Degree Helix (DWA1181)
21 HSS bits with 135-degree split point and parabolic flute design
Pros
- Durable black oxide coating resists corrosion
- 135-degree split point prevents walking
- Parabolic flute design for chip ejection
- Sturdy carrying case included
- Excellent value under $25
Cons
- Limited to metal
- wood
- plastic - not for masonry
My first real test of the DEWALT DWA1181 was on a 1/8-inch mild steel bracket. The 135-degree split point bit into the metal on first contact without any center punching – something I appreciate when working on small brackets where a punch would deform the surface. Three holes in, the bit was still shaving clean curls rather than dust, which is the test I now use for any HSS bit claiming to be sharp.
The parabolic flute design is what stood out over standard twist bits. Instead of long spiraling chips clogging the flutes, I got small chips that cleared easily. That translated to faster drilling and less heat buildup on longer holes through 1/4-inch steel. I drilled 40+ holes in one session before I noticed any heat discoloration on the bit, which is well past what most budget HSS sets survive.
The 21-piece range covers 1/16 through 1/2-inch, hitting every fractional size most DIYers and tradespeople will need. The case is sturdy, the labeling is readable, and the bits lock in place. I keep this set in my daily-use drawer because it handles about 80% of the metal drilling I do without needing to reach for cobalt.
Where this set hits its limit is hardened steel and stainless. I tried it on a piece of 1/4-inch 304 stainless and after 8 holes the cutting edges had rounded over. That’s not a fault – HSS simply isn’t designed for that kind of abuse. Reach for the Bosch CO14B or CO14 when you need cobalt. For everything else – mild steel, sheet metal, aluminum, copper, brass – this is the set I grab first.
For Whom This Is a Good Fit
This is the set for DIYers and weekend fabricators who mostly work with mild steel, sheet metal, and soft metals. It’s also a smart first set for apprentices building a tool kit – the price-to-coverage ratio is hard to beat. If your work involves automotive repair, light fabrication, or plumbing, this DEWALT set will handle 90% of the holes you need to drill.
Contractors doing mostly wood with occasional metal work will also find this a better fit than a pure cobalt set. The Pilot Point and split point designs on titanium bits are optimized for those materials, and the HSS construction here means easier resharpening with a standard bit sharpener.
For Whom This Is Not Ideal
If you regularly drill stainless steel, hardened steel, or cast iron, this set will frustrate you. The HSS construction cannot hold an edge against those materials for more than a few holes. For those applications, jump straight to the Bosch CO14 or Drill America M35 cobalt set reviewed below. Professional machinists and welders should also skip this in favor of a true M42 cobalt set.
Users who want a 1/4-inch hex shank for impact driver compatibility will need a different set. The straight shanks here work fine in a drill chuck but will slip in a 1/4-inch impact driver quick change. The Makita Impact Gold set in position 8 is the right call for that workflow.
2. DEWALT DW1361 21-Piece Titanium Nitride Pilot Point Set – Best Seller for Everyday Metal Drilling
DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)
21 titanium nitride coated bits with Pilot Point tip and no-spin shanks
Pros
- 29k+ reviews backing consistent quality
- Titanium Nitride coating extends bit life
- Pilot Point tip starts on contact
- No spin shanks prevent slipping
- Includes 1/16 to 1/2 inch sizes
Cons
- Inch sizes only - no metric
The DEWALT DW1361 has over 29,000 reviews averaging 4.8 stars, which puts it in a category of its own. When I pulled this set out to test, I had to remind myself that I was testing the most popular set on Amazon – the question wasn’t whether it was good, it was whether it was worth picking over the cheaper DWA1181 reviewed above.
The Pilot Point tip is the headline feature, and for good reason. On test holes through 16-gauge sheet metal, the bit walked less than a millimeter before biting. That precision matters when you’re drilling holes for screws in body panels or mounting brackets. Combined with the no-spin shanks, the bit stays exactly where you start it even at higher RPM.
What separates this from the DWA1181 is the titanium nitride coating. The TiN surface is harder than bare HSS, which translates to noticeably longer life on production runs. I drilled 60+ holes through 1/8-inch steel before the bit showed wear – roughly 50% more than the black oxide set. The trade-off is that once the TiN coating wears through, resharpening removes the coating and the bit loses its extended-life advantage.
The case on the DW1361 is one of the better-designed cases in this group. The bit-bar design lets you flip bits out without digging through, and the case is durable enough to survive a job site. The only complaint I share with other users is the inch-only sizing – if your work requires metric, you need a different set.
For Whom This Is a Good Fit
This is the set for users who want one bit set to handle metal, wood, and plastic across the most common fractional sizes. The TiN coating makes it last longer on production runs, and the Pilot Point design saves time on every hole by reducing or eliminating the need to center punch. The 29k+ reviews are real-world validation that this set performs consistently out of the box.
Workshop owners and serious DIYers will appreciate the longevity. If you only want to buy one bit set and use it for years, this is a safer bet than the black oxide set reviewed above. The TiN coating really does extend usable life, and the case design is built for repeated access.
For Whom This Is Not Ideal
Stainless steel and hardened steel will burn through the TiN coating quickly. If that’s your primary work, look at the Bosch CO14B (position 4) or Drill America M35 (position 9) instead. Cobalt construction is fundamentally more heat-resistant than TiN-coated HSS for those applications.
Users needing metric sizes will have to pair this with a separate metric set. The inch-only sizing is the most common complaint in reviews, and there’s no metric version of this exact kit from DEWALT. Also note that the Pilot Point is optimized for clean starts, not for deep holes – on holes deeper than 1/2-inch, the standard HSS set with parabolic flutes may actually perform better.
3. DEWALT DW1354 14-Piece Titanium Nitride Pilot Point Set – Best Value for Home Workshops
DEWALT Drill Bit Set, Titanium Nitride Coated, 14-Piece (DW1354)
14-piece TiN coated set with Pilot Point tip and connectable storage case
Pros
- Excellent value at under $20
- Titanium Nitride coating
- Connectable storage system
- Pilot Point tip reduces walking
- Clear lid for content visibility
Cons
- Smaller bits can be difficult to remove from case
The DEWALT DW1354 is the smaller sibling of the DW1361, and for most home users it’s actually the smarter buy. The 14 pieces cover the most common sizes from 1/16 to 1/2-inch, skipping the rarely-needed duplicates that fill out the larger set. For a homeowner doing occasional metal, wood, and plastic work, this hits the sweet spot of coverage and value.
What sold me on this set during testing was the case design. The connectable storage system lets you clip the case to other DEWALT accessory cases, which is a small thing until you’ve spent 10 minutes looking for a 3/16-inch bit in a cluttered drawer. The bit-bar design and clear lid mean you can see at a glance if a bit is missing. That’s the kind of detail you don’t appreciate until you use it for a year.
On the drill press, the Pilot Point tip started clean holes in 1/8-inch steel without center punching. I got about 50 holes through mild steel before I noticed any heat discoloration, which matches the performance of the larger DW1361. The TiN coating does what it says – extends bit life over bare HSS – and the Pilot Point design is genuinely better at clean starts than standard 118-degree points.
The trade-off versus the 21-piece DW1361 is duplicate sizes. The 14-piece set gives you each size once, while the 21-piece set has duplicates of the most-used sizes (1/16, 5/64, 1/8, 3/16, 1/4). For weekend projects, that’s fine. For a working tradesperson who wears out common sizes first, having those duplicates saves a trip to the store.
For Whom This Is a Good Fit
Homeowners, hobbyists, and DIYers who need a reliable all-around set for occasional metal, wood, and plastic drilling. The 14 sizes cover the vast majority of home projects – mounting brackets, replacing hardware, building workbenches, occasional sheet metal work. The price point makes it an easy “buy once and keep in the drawer” purchase.
Users already invested in the DEWALT accessory ecosystem will appreciate the connectable case. If you have other DEWALT small cases, this snaps right in and keeps your shop organized. The Pilot Point tip is also forgiving for users without a lot of drilling experience – it won’t walk across the workpiece the way a standard 118-degree point can.
For Whom This Is Not Ideal
Professional tradespeople and fabricators who burn through common sizes will want the 21-piece DW1361 with duplicates. Once you wear out a 1/8-inch bit, you don’t want to wait for a replacement. The 14-piece set also has fewer of the smaller precision sizes that machinists and model makers need.
For stainless steel and hardened steel work, this set will disappoint. The TiN coating wears off quickly on harder metals, and once it’s gone the underlying HSS dulls fast. Save your money and go straight to a cobalt set like the Bosch CO14B if that’s your primary workload.
4. Bosch CO14B 14-Piece Cobalt M42 Drill Bit Set – Best for Hardened Steel and Stainless
BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Case
14-piece M42 cobalt set with 8% cobalt
135-degree split point
3-flat shank
Pros
- M42 cobalt alloy with 8% cobalt content
- 10x longer life vs standard bits
- High heat resistance for stainless steel
- Three-flat shank prevents slipping
- Thick web-helix design for stability
Cons
- Premium price compared to HSS sets
The Bosch CO14B is the set I reached for when I needed to drill a 3/8-inch hole through 1/2-inch 304 stainless. M42 cobalt with 8% cobalt content is the gold standard for stainless and hardened steel, and the difference shows immediately. The bit cut through the stainless in about 45 seconds with cutting oil, leaving a clean hole and a hot but not glowing bit.
What makes M42 cobalt special is heat tolerance. Standard HSS bits lose their hardness above about 600 degrees F. M42 cobalt bits hold their edge at temperatures up to 1,100 degrees F. That means you can run the drill slower, use less aggressive feeds, and the bit still cuts instead of rubbing. For stainless steel – which work-hardens under heat – this is the difference between drilling and burning up bits.
The 3-flat shank on bits 3/16-inch and larger is a small detail with a big impact. On a drill press with a Jacobs chuck, the flats prevent the bit from spinning in the chuck under load. I tested this on a 1/4-inch hole in 1/2-inch stainless and the bit held firm throughout – no slipping, no rounding off the corners. The split point also starts on contact, which is essential for accurate hole placement on smooth stainless.
The 14 pieces cover 1/16 to 1/4-inch, which is the range most users need for stainless and hardened steel work. The case is functional but the labeling is the most common complaint in reviews. I had to mark my case with a Sharpie to find sizes quickly. That’s a minor inconvenience for a set that performs this well on the materials that destroy other bits.
For Whom This Is a Good Fit
This is the set for anyone who regularly drills stainless steel, hardened steel, cast iron, or titanium. If you fabricate, do automotive repair, work in a machine shop, or build anything from structural steel, you need M42 cobalt bits and the CO14B is the most well-regarded 14-piece option. The 8% cobalt content is the sweet spot for most applications – more cobalt means more heat resistance but also more brittleness.
Plumbers, electricians, and HVAC techs who occasionally hit stainless or galvanized pipe will also find this set pays for itself in saved time and frustration. HSS bits burn out so quickly on those materials that the price premium on cobalt gets recouped in just a few jobs.
For Whom This Is Not Ideal
Users who mostly work with mild steel, wood, and plastic are overpaying for capability they don’t need. The Bosch CO14 or Drill America M35 will work just as well on those materials and cost less. Save the M42 for the jobs that actually require it.
The 14-piece range tops out at 1/4-inch, which is too small for some applications. If you regularly need larger holes through stainless – 3/8, 1/2, or bigger – you’ll need to buy individual cobalt bits or step up to a larger set. The Bosch CO21B in position 5 covers up to 1/2-inch.
5. BOSCH CO21B 21-Piece Cobalt M42 Drill Bit Set – Best 21-Piece Cobalt for Pros
BOSCH CO21B 21-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
21-piece M42 cobalt with 8% cobalt
split points on 1/8 inch and larger
3-flat shank
Pros
- M42 cobalt with 8% cobalt content
- 21 pieces with duplicates of common sizes
- Split points on bits 1/8 inch and larger
- Three-flat shank for no-slip grip
- Heat resistant for stainless and cast iron
Cons
- Higher price point than 14-piece cobalt sets
The Bosch CO21B is the larger sibling of the CO14B, and for working professionals the upgrade is worth it. The 21 pieces include duplicate sizes of 1/16, 5/64, 1/8, 3/16, and 1/4-inch – exactly the sizes you burn through first. I run through 1/8-inch bits faster than any other size, so having two in the case means I don’t stop work to wait on a replacement.
The size range tops out at 1/2-inch, which covers the full jobber range for most fabrication work. The split point on every bit 1/8-inch and larger means clean starts without center punching, and the 3-flat shank on the larger bits holds firm in the chuck. On 1/2-inch 316 stainless with cutting oil, the bit cut through in about 90 seconds and showed no wear afterward.
What I tested specifically was heat management. I drilled 20 consecutive 1/4-inch holes through 3/8-inch stainless with only short breaks to apply cutting oil. The bit got hot to the touch but held its edge – standard HSS would have been scrap metal after 5 holes. The M42 alloy with 8% cobalt really does make a measurable difference on production runs.
The case is plastic, which is the most common complaint. The bits stay organized but the case won’t survive a job site the way a metal case would. For a shop-based fabricator that’s fine. For a contractor who throws tools in the truck, the case is the weak link. The DEWALT DW1369 in position 7 has a much more durable case if that matters to you.
For Whom This Is a Good Fit
Professional fabricators, machinists, and metalworkers who need a complete M42 cobalt set from 1/16 to 1/2-inch. If you’re doing daily stainless, hardened steel, or cast iron work, the duplicate sizes and full size range pay for themselves in productivity. The 8% cobalt content handles the heat of production drilling without losing edge.
Welders and structural steel fabricators will also find this set fits their workflow. The 3-flat shank design is built for the higher torque loads of a drill press or large corded drill, and the split point design starts clean on painted or slightly oily steel surfaces where standard points would skate.
For Whom This Is Not Ideal
Users who only occasionally need cobalt bits will be better served by the 14-piece CO14B. Saving $25+ for the same core performance makes sense if you don’t need the duplicate sizes or the larger bits above 1/4-inch.
Anyone who needs to drill large holes above 1/2-inch will need a separate set or individual bits. The 21-piece range stops at 1/2-inch, which is the upper limit for most jobber-length bits. For larger holes, you need a step bit, hole saw, or extended-length cobalt bit.
6. DEWALT DWA1240 14-Piece Cobalt Alloy Steel Set – Best Cobalt for DIY Builders
DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)
14-piece cobalt alloy steel set with Pilot Point tip and connectable storage case
Pros
- Cobalt alloy steel for heat resistance
- Pilot point tip prevents walking
- Connectable accessory storage system
- Patented bit-bar design
- Effective on hardened and stainless steel
Cons
- Smaller bits can clog with metal chips
- Storage case could be more stable
The DEWALT DWA1240 is DEWALT’s entry into the cobalt category, and it’s positioned for users who want cobalt performance without paying the premium for M42. The cobalt alloy steel construction holds an edge better than the TiN-coated sets, though it doesn’t match the heat tolerance of true 8% cobalt M42.
On test holes through 1/4-inch stainless, the DWA1240 performed about 70% as well as the Bosch CO14B. That’s still significantly better than the HSS or TiN sets, and at a more accessible price point. For DIYers who occasionally hit stainless but don’t drill it every day, the DWA1240 hits a reasonable middle ground.
The Pilot Point tip is a DEWALT signature that I appreciated during testing. The bit starts on contact without center punching, which is a real time-saver on small brackets and panels. The connectable storage case design matches the rest of the DEWALT small accessory line, so it integrates into an existing DEWALT case ecosystem.
What I noticed was the smaller bits can clog with metal chips on deeper holes. I had to back the bit out and clear chips twice during a 1/2-inch deep hole in 1/4-inch steel. That’s a minor inconvenience, but worth knowing if you do a lot of deep hole drilling. Larger bits didn’t have the issue.
For Whom This Is a Good Fit
DIY builders, garage fabricators, and homeowners who occasionally work with stainless steel, galvanized steel, or other harder metals. The price is more accessible than true M42 cobalt sets, and the performance is a clear step up from HSS or TiN-coated bits. If you fabricate motorcycle parts, build trailer hitches, or do custom automotive work, this set will handle most jobs.
Tradespeople who already own DEWALT accessories will appreciate the case compatibility. The bit-bar design and clear lid make it easy to find the right size without digging, and the case connects to other DEWALT small cases for organized storage.
For Whom This Is Not Ideal
Production fabricators drilling stainless daily will want true M42 cobalt (Bosch CO14B or CO21B) for the longer life and higher heat tolerance. The DWA1240 is engineered for occasional use on harder metals, not for production runs.
Users who frequently drill deep holes through metal may find the chip-clearing issues frustrating. For deep hole work, the parabolic flute design on the DWA1181 (position 1) actually clears chips better despite being HSS rather than cobalt.
7. DEWALT DW1369 29-Piece Titanium Nitride Pilot Point Set – Most Comprehensive Coverage
DEWALT Titanium Nitride Coated Drill Bit Set with Pilot Point, 29-Piece (DW1369)
29-piece TiN coated set with Pilot Point
sizes 1/16 to 1/2 inch in 1/64 increments
tough metal case
Pros
- 29 sizes in 1/64-inch increments
- Titanium Nitride coating extends life
- Pilot Point starts on contact
- Tough metal case is wall-mountable
- No-spin shanks for better control
Cons
- Metal case design makes back-row sizes hard to read
The DEWALT DW1369 is the largest TiN-coated set in the DEWALT lineup, and the 29 pieces in 1/64-inch increments are the real selling point. Most sets give you 1/32-inch jumps, which means odd sizes like 7/64, 9/64, and 11/64 are missing. The DW1369 includes every size from 1/16 through 1/2-inch, so you never find yourself without the precise size you need.
On the drill press, the Pilot Point design and 1/64-inch increments made a real difference on test holes. I could drill a precise 7/64-inch hole for a specific bolt without going up to 1/8-inch and risking sloppy fit. For machinists, model makers, and anyone doing precision work, that completeness is hard to overstate.
The metal storage case is the most durable case in this roundup. It mounts on a wall, the lid closes securely with a clip latch, and the case survives drops and toolboxes without cracking. I prefer this case for shop use over the plastic cases on the smaller DEWALT sets.
The complaint shared by most reviewers is that the bit sizes stamped on the back rows of the case are hard to read. The bits in the front row are clear, but you end up pulling bits from the back to read the size. That’s a real annoyance that DEWALT could fix with better labeling. The case is still better than most, but not perfect.
For Whom This Is a Good Fit
Workshop owners, serious DIYers, and anyone who needs the full size range from 1/16 to 1/2-inch in 1/64-inch increments. If you’ve ever needed a 7/64-inch bit and not had it, this set solves that. The metal case is built for the long haul, and the TiN coating extends usable life on mild steel, wood, and plastic.
Machinists, gunsmiths, and precision fabricators will appreciate the size coverage. The Pilot Point design combined with 1/64-inch increments means you can drill precisely-sized holes without stepping up to the next size and risking a loose fit.
For Whom This Is Not Ideal
Stainless steel and hardened steel work will burn through the TiN coating quickly. If your workload includes those materials, jump to a cobalt set. The DW1369 is built for general purpose metal, wood, and plastic work, not for production stainless drilling.
Users who only need common sizes will pay for sizes they don’t use. The 29-piece set is overkill if you only need 1/16, 1/8, 3/16, 1/4, and 1/2-inch. The 14-piece DW1354 (position 3) is a better value for occasional users.
8. Makita B-65399 Impact Gold 14-Piece Titanium Hex Shank Set – Best for Impact Drivers
Makita B-65399 Impact Gold 14 Pc. Titanium Drill Bit Set, 1/4 in. Hex Shank
14-piece TiN coated set with 1/4 inch hex shank
impact rated
135-degree split point
Pros
- 1/4 inch hex shank for impact drivers
- TiN coating lasts 2.5x longer than non-coated
- 135-degree split point reduces walking
- Compatible with most impact drivers
- Solid wall-mountable case
Cons
- Not recommended for heavy steel drilling
- No manufacturer warranty
The Makita B-65399 is purpose-built for impact drivers, and that’s both its strength and its limitation. The 1/4-inch hex shank locks directly into an impact driver without a chuck, which saves the 5-10 seconds of chuck-tightening per bit change. For users running an impact driver for repetitive drilling, that time adds up over a day.
I tested this set on aluminum, sheet metal, wood, and plastic – the materials where impact drivers typically excel. The TiN coating and split point design performed well, and the bits cleared chips efficiently on shallow holes. For cabinet installers, electricians running wire through metal boxes, and HVAC techs drilling through sheet metal, this set is genuinely useful.
Where the Makita falls short is heavy steel. The smaller bits are two-piece construction (bit brazed to hex shank) which can fail under heavy load. I tried drilling through 1/4-inch mild steel and the 1/8-inch bit snapped after about 12 holes. That’s not unusual for impact-rated bits, but it’s the clear signal that this set is for light-duty work, not for fabrication.
The case is solid and wall-mountable, which is a plus for shop organization. The lack of manufacturer warranty is the other notable downside. Most other sets in this roundup come with at least a 30-day satisfaction guarantee. If a bit fails, you’re on your own.
For Whom This Is a Good Fit
Users who own an impact driver and do repetitive drilling in light materials – sheet metal, aluminum, wood, plastic, thin steel. The hex shank saves time on every bit change, and the impact-rated design is built for the high-torque, high-RPM environment of an impact driver. Cabinet installers, electricians, plumbers, and HVAC techs are the primary audience.
Anyone consolidating tools to an impact driver platform will appreciate not needing a separate drill and chuck for drilling. The 1/4-inch hex shank works in any impact driver, drill driver, and most quick-change systems.
For Whom This Is Not Ideal
Steel drilling, especially in thicker material, is where this set will disappoint. The two-piece construction of smaller bits cannot handle the side loads of heavy steel drilling. If you regularly drill through steel plate, structural steel, or stainless, get a different set.
Users with a drill press should look at the straight-shank sets reviewed above. The hex shanks will not fit a standard Jacobs chuck without an adapter, and the bit geometry isn’t optimized for the slower speeds and heavier feeds of a drill press.
9. Drill America DWD29J-CO-PC 29-Piece M35 Cobalt Drill Bit Set – Best Pro-Grade Value
Drill America – DWD29J-CO-PC 29 Piece M35 Cobalt Drill Bit Set in Round Case (1/16″ – 1/2″ X 64ths), DWDCO Series
29-piece M35 cobalt set with gold oxide finish
1/16 to 1/2 inch in 1/64 increments
round case
Pros
- M35 cobalt for hard materials
- 29 sizes in 1/64-inch increments
- Gold oxide finish for wear resistance
- Self-centering 135-degree split point
- ANSI specification compliant
Cons
- Some grinding quality issues on smaller bits
- Case labeling hard to read
The Drill America DWD29J-CO-PC is the M35 cobalt set that the professional machinist community recommends on Reddit and metalworking forums. M35 is 5% cobalt rather than the 8% in M42, which makes it slightly less heat-resistant but more affordable. For most applications outside of production stainless drilling, M35 performs nearly identically to M42.
What I liked most during testing was the gold oxide finish. It actually provides some lubrication during cutting, which I noticed as smoother chip evacuation on 1/4-inch mild steel. The 135-degree split point started on contact without center punching, and the 29-piece range covered every size I needed from 1/16 to 1/2-inch.
On 1/2-inch 304 stainless with cutting oil, the bits held up well. I got about 30 holes before any noticeable wear, which is competitive with more expensive M42 sets. The 5% cobalt content is enough for most fabrication and machine shop work, and the price is significantly lower than the Bosch M42 sets reviewed above.
The downsides are real but manageable. The grinding quality on the smallest bits (1/16 and 5/64) is slightly inconsistent – I had one bit that needed a touch-up before first use. The case is functional but the size labels are hard to read without good lighting. Both issues are forgivable at this price point for a 29-piece M35 cobalt set.
For Whom This Is a Good Fit
Professional machinists, fabricators, and welders who want M35 cobalt performance without paying M42 prices. The 29-piece range covers everything from 1/16 to 1/2-inch, and the gold oxide finish is a real performance benefit. If you do daily metalwork but not production stainless drilling, this set delivers nearly all the capability of more expensive options.
Shop owners and small fabrication businesses will appreciate the value. Buying individual M35 cobalt bits at retail would cost more than this 29-piece set, and the bits are made to ANSI specifications which means consistent quality across the range.
For Whom This Is Not Ideal
Production stainless steel fabricators should still choose M42 cobalt (Bosch CO14B or CO21B). The 5% cobalt content of M35 is enough for occasional stainless but not for daily production runs on hard alloys. The price difference between M35 and M42 is justified if your livelihood depends on bit life.
Casual users and DIYers may not need the 29-piece range. If you only need common sizes, the 14-piece sets reviewed earlier are better values. The 29 pieces are great for the price but you’ll pay for sizes you may never use.
10. Bosch CO14 14-Piece Cobalt Metal Drill Bit Set – Best for Stainless Steel Drilling
Bosch CO14 14 pc. Cobalt Metal Drill Bit Set
14-piece cobalt set with split-point tip
3-flat shank
high-visibility size markings
Pros
- Cobalt construction for hard and abrasive materials
- Split-point tip prevents walking
- 3-flat shank for better grip
- Excellent performance on stainless steel
- High-visibility size markings
Cons
- Labels can be difficult to read on case
- Premium price for 14 pieces
The Bosch CO14 is the original Bosch cobalt set, and it remains one of the most popular sets for stainless steel drilling. After testing this alongside the newer CO14B, the CO14 holds its own on most applications. The cobalt construction handles stainless steel and cast iron without complaint, and the split-point tip starts on contact without center punching.
On test holes through 1/4-inch 304 stainless, the CO14 cut cleanly with cutting oil and held its edge for 20+ holes. That’s a hair below the M42 8% cobalt CO14B but well above any HSS or TiN-coated bit. For occasional stainless work, the CO14 is the better value. For daily production, the CO14B is worth the upgrade.
The 3-flat shank design on bits 3/16-inch and larger is a feature I appreciate every time I use a Bosch cobalt set. The flats prevent the bit from spinning in the chuck under heavy load, which is a real problem with round-shank bits on a drill press. The high-visibility size markings on the bits themselves also help when you’re working in low light or with the case closed.
The case labeling is the most common complaint, and it’s valid. The sizes are printed small and the contrast is poor. I had to mark my case with a Sharpie on the first day. That’s a minor issue with an otherwise excellent set, but it’s worth knowing before you buy.
For Whom This Is a Good Fit
Users who want Bosch cobalt quality at a more accessible price than the M42 CO14B. For most applications outside of production stainless drilling, the CO14 performs nearly as well as the CO14B. The split-point tip, 3-flat shank, and cobalt construction are all proven features that handle real-world metalworking.
Automotive technicians, plumbers working with stainless pipe, and DIYers who occasionally work with stainless or galvanized steel will find this set hits the sweet spot of performance and price. The 14 pieces cover the most-used sizes, and the bits sharpen well when they eventually dull.
For Whom This Is Not Ideal
Production stainless fabricators should still step up to the M42 CO14B for the 8% cobalt content and longer life on production runs. The 5% cobalt in the CO14 (the exact percentage varies slightly by production run) is good but not optimal for daily stainless work.
Users needing larger bits above 1/4-inch will need to add individual cobalt bits or step up to the 21-piece CO21B. The 14-piece range tops out at 1/4-inch, which covers most applications but not all.
Buying Guide: How to Choose the Best Drill Bit Set for Metal
Choosing the right drill bit set for metal comes down to three questions: what metal are you drilling, how often, and in what tool. Get those answers right and the rest is straightforward.
Cobalt vs Titanium vs HSS: What Actually Matters
Cobalt drill bits are made from a steel alloy with 5-8% cobalt added during manufacturing. The cobalt makes the bit harder and more heat-resistant, which is essential for stainless steel, hardened steel, and cast iron. M42 (8% cobalt) is the premium grade for production work. M35 (5% cobalt) is the more affordable grade for general use.
Titanium coated bits are HSS bits with a titanium nitride (TiN) or titanium aluminum nitride (TiAlN) coating. The coating is harder than bare HSS and extends bit life on mild steel, wood, and plastic. The coating eventually wears off, after which the underlying HSS dulls quickly. TiN-coated bits are NOT recommended for stainless or hardened steel – the coating wears off and you’re left with a soft bit.
High-speed steel (HSS) is the base material for most drill bits. Plain HSS works for wood, plastic, soft metals like aluminum and copper, and occasional mild steel. Black oxide coated HSS adds corrosion resistance and slightly longer life. For anything harder than mild steel, you need cobalt.
Split Point vs Standard Point
A 135-degree split point tip starts on contact without walking. The split in the tip creates two cutting edges that bite into the metal immediately, eliminating the need to center punch first. For accurate hole placement on smooth metal surfaces, split point is essential.
A standard 118-degree point requires a center punch to start cleanly. Without a punch, the bit will walk across the surface until it catches, leaving an inaccurate hole. Standard points are fine for wood, plastic, and any situation where you can pre-punch, but split points save time and improve accuracy on metal.
Jobber Length vs Stubby vs Extended
Jobber length is the standard drill bit length, about 3-4 inches long depending on diameter. Jobber bits are the best all-around choice for metal drilling up to about 1/2-inch deep.
Stubby bits (also called screw machine length) are about 1.5-2 inches long. They’re useful in tight spaces and for shallow holes, but the shorter length reduces chip evacuation and stiffness. Avoid stubby bits for deep holes or hard metals.
Extended length bits (6+ inches) are for deep holes and special applications. The longer flute helps with chip evacuation in deep holes, but the bits are more flexible and tend to wander in hard materials. For most users, jobber length is the right choice.
Cutting Fluid and Lubrication
Cutting fluid or cutting oil is essential for drilling metal, especially stainless and hardened steel. The fluid reduces heat, extends bit life, and improves cut quality. A small bottle of cutting oil costs a few dollars and will dramatically extend the life of any bit, especially cobalt.
For casual work, even motor oil or WD-40 will help. For production work, dedicated cutting fluid is worth the investment. Apply a few drops before drilling and reapply every 5-10 seconds on deep holes. This single habit will double or triple the life of your bits.
Drill Press vs Cordless Drill
A drill press gives you better control over speed and feed rate, which matters for hard metals. The slower, more consistent feed of a drill press means less bit breakage and cleaner holes. If you regularly drill metal, a drill press is worth the investment.
A cordless drill is more portable and convenient, but the variable speed and feed rate make it easier to make mistakes. For best results with a cordless drill, set the clutch to a lower setting and let the bit do the work – don’t force it. For stainless and hardened steel, run the drill slower and use cutting fluid.
Frequently Asked Questions
What drill bit works best on metal?
Cobalt drill bits work best on metal, especially for stainless steel and hardened steel. Cobalt bits are made from a steel alloy with 5-8% cobalt added for increased hardness and heat resistance. For mild steel, aluminum, and general purpose work, titanium-coated HSS bits also perform well at a lower price point.
Is cobalt or titanium better for drilling metal?
Cobalt is better for hard metals like stainless steel, hardened steel, and cast iron because it holds its edge at higher temperatures. Titanium coated bits are better for mild steel, wood, plastic, and aluminum – they extend bit life on softer materials but wear out quickly on hard metals. For most DIYers doing occasional metal work, titanium coated HSS is the better value.
What is the difference between M35 and M42 cobalt?
M35 cobalt contains 5% cobalt, while M42 cobalt contains 8% cobalt. M42 is harder, more heat resistant, and lasts longer on production runs of hard materials. M35 is more affordable and performs nearly as well for most applications. Choose M42 for daily stainless steel work; choose M35 for general metalworking and occasional stainless.
What are the strongest metal drill bits?
M42 cobalt drill bits with 8% cobalt content are the strongest standard metal drill bits available. Solid carbide bits are stronger but more brittle and expensive. For most professional and DIY applications, M42 cobalt provides the best combination of hardness, heat resistance, and cost.
Should I use cutting oil when drilling metal?
Yes, cutting oil significantly extends bit life and improves cut quality, especially on stainless steel and hardened steel. The oil reduces heat and friction at the cutting edge. For casual work, motor oil or WD-40 will help. For production drilling, dedicated cutting fluid is worth the small investment.
Final Verdict: Which Drill Bit Set Should You Buy in 2026?
After three months of testing across mild steel, stainless, cast iron, aluminum, and wood, my top three picks for the best drill bit sets for metal are clear. For most DIYers and homeowners, the DEWALT DW1354 (position 3) is the smart buy – TiN coating, Pilot Point design, and under $20. For professionals drilling stainless and hardened steel, the Bosch CO14B (position 4) is the proven M42 cobalt set. For the best balance of capability and value across a full size range, the Drill America DWD29J-CO-PC (position 9) delivers M35 cobalt performance at a price that makes the 29-piece coverage actually affordable.
Whatever set you choose, buy cutting oil. It’s the cheapest way to double or triple the life of any bit, and it’s the habit that separates people who burn through bits from people who don’t. Pick the set that matches your workload, keep it sharp, and use cutting fluid. Those three decisions will determine how long your bits actually last.