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Drilling into metal feels different from wood. The bit wants to skate across the surface, the heat builds fast, and one wrong angle snaps a cheap tip. You are here because you want holes in steel, stainless, or cast iron without ruining a workpiece or your drill. What actually matters is the cutting geometry, the metal the bit is made from, and whether the tip can start on its own without a center punch.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
You need drill bits that cut through steel without dulling fast, so this guide ranks the top sets for your drill press or handheld drill. You’ll learn how cobalt, titanium, and high-speed steel (HSS, a basic steel alloy) differ, and why a 135-degree split point (a chisel-shaped tip that bites into metal instead of wandering) matters for clean holes.
Our Picks at a Glance
How To Choose The Best Drill Bits for Metal
Buying the wrong bit wastes money and time. Metal drilling punishes bad geometry with burned tips and shattered flutes. You want a bit that starts where you place it and keeps cutting without constant re-sharpening.
Material: Cobalt vs. Titanium vs. HSS
For serious metal work, M35 cobalt steel with 5% cobalt resists the heat that kills plain high-speed steel (HSS). Titanium nitride coatings help bits run longer and start cleaner, but they are a surface treatment, not a change to the steel underneath. Plain HSS is fine for soft steel and aluminum, but it dulls fast on stainless.
Point Geometry: The 135-Degree Split Point
A split point lets the bit bite into metal without skating sideways. A 135-degree angle is the standard for harder metals because it holds up better under pressure than a general-purpose 118-degree point. It self-centers, so you skip the center punch for most jobs.
Set Size and Sizing Systems
Think about the sizes you actually drill. Imperial sets run from 1/16-inch up to 1/2-inch in 64ths, while metric sets run from 1mm to 13mm. A 13-piece set covers basic needs; a 29-piece set covers nearly every fastener hole you will meet. Look for duplicates of the small sizes, because those are the ones that snap.
Quick Comparison
| Model | Best For | Material | Pieces | Size Range | Amazon |
|---|---|---|---|---|---|
| Norseman 44170★ Best Overall | Heavy daily steel work | HSS Gold Oxide | 29 | 1/16″ – 1/2″ | Amazon |
| DelitonGude M35Budget Champion | Budget stainless drilling | M35 Cobalt | 13 | 1/16″ – 1/4″ | Amazon |
| RCINDUS 15PCSSingle-Size Specialist | Single-size heavy drilling | M35 Cobalt | 15 | 1/4″ only | Amazon |
| WildBossy M35 | Metric workshop needs | M35 Cobalt | 19 | 1mm – 10mm | Amazon |
| STROTON Cobalt | Hardened steel and iron | Cobalt Steel | 17 | 1/16″ – 1/2″ | Amazon |
| IRWIN 316015 | Keyless chucks and sheared bolts | Cobalt Alloy | 15 | Assorted | Amazon |
| MACXCOIP Metric 25Pcs | Full metric coverage | M35 Cobalt | 25 | 1mm – 13mm | Amazon |
| DeWalt DW1969 | Pilot point precision | Gold Ferrous Oxide | 29 | 1/16″ – 1/2″ | Amazon |
| DeWalt DW1369 | Clean starts on contact | Titanium Nitride | 29 | 1/16″ – 1/2″ | Amazon |
In-Depth Reviews
1. Norseman Drill Bits 44170 Ultra Dex (29 Piece)
Our pick — over 4.5★ from 950+ verified ratings; the strongest balance of quality and price.
The shop-grade set that chews through hardened steel all day and still holds an edge.
The NAS 907B certification — a military-grade standard for general-purpose metalworking twist drills — guarantees precision-ground geometry on every bit. It means the 29 bits, covering 1/16 to 1/2 inches in 64ths, are precision ground on the point, flutes, body, and clearance for accuracy, not just sharpened at the tip. Buyers consistently describe them as cutting through hardened steel like a hot knife through butter, and the quality is the single most-praised aspect across the board.
Buyers praise the edge retention. One reviewer reports, “These are great drill bits have abused and abused these drilled hundreds and hindreds of holes over the last 4 years and have finally burnt and dulled most of them out” — and that was with hardly ever using cutting oil. The hi-molybdenum tool steel (a high-strength alloy) with a gold oxide finish resists heat, so the bits survive jobs that would ruin a cheap import set. Many note these are their second or third set because the first ones never wore out.
The catch is the premium price and the 2-pound case, which is built for a shop bench rather than a pocket. It is an investment, but the cost per hole over four years of abuse makes it the smart buy for anyone drilling heavy metal regularly. The flutes clear chips well, and at 135 degrees the split point starts true without wandering on smooth surfaces.
What keeps people loyal
- NAS 907B precision-ground geometry cuts true every time
- Gold oxide finish resists heat and wear
- Full 1/16″ to 1/2″ coverage in 64ths
- Holds an edge for years of heavy use
What to weigh up
- Premium price tag upfront
- 2-pound case suits a shop bench, not a tool bag
Reach for it if: you drill steel or stainless weekly and want one set that outlasts everything else in the drawer.
Look elsewhere if: you only drill a few holes a year and do not want to tie up that much money in bits.
2. DelitonGude M35 Cobalt Twist Drill Bits (13 Piece)
The budget set that quietly handles stainless steel jobs where brand-name titanium quits.
You get 13 imperial sizes from 1/16-inch up to 1/4-inch, each made from M35 high-speed steel with 5% cobalt. That cobalt content is the key: it resists the heat that dulls plain steel bits, which is exactly why buyers report successfully drilling bronze where a Milwaukee titanium bit failed — using slow speed and cutting oil. The full-grind nitriding and spiral groove design keep chip removal working, so the bit does not bind and snap.
The 135-degree tip and twist design give self-centering action that prevents walking, meaning you can start a hole without a center punch on most surfaces. The performance is the most-praised aspect, and the value earns strong mentions too. Durability gets mixed feedback, which is the honest trade-off at this level — some owners mention bits lasting through multiple stainless holes, while others snapped the smaller 13/64-inch sizes on hard T-posts.
The 13-piece count is a 2.2x coverage gap versus the 29-piece Norseman above. The tiny 1/16-inch bits are the fragile ones, so treat the small sizes as consumables. For light to medium steel work at a friendly price, this set is tough to top. For a heavy single-size project, you may prefer a dedicated set instead.
Smart money move: a 5% cobalt set that out-cuts titanium on bronze and stainless for a fraction of the cost of premium sets.
Know the limit: the smaller bits are the weak point — treat the 1/16″ to 13/64″ sizes gently or expect to replace them.
3. RCINDUS 1/4″ Cobalt Drill Bit (15 Piece)
Fifteen identical 1/4-inch bits built for one job: drilling clean holes through stubborn layered metal.
This set answers a specific pain — when you need one exact size over and over. You get 15 pieces of 1/4-inch (6.35mm diameter) M35 cobalt steel, and the 135-degree split point self-centers so it will not skate on a hard surface. Customers note drilling clean holes through hard drives and phones, cutting through layers of steel and PCB without the bit dulling, outperforming DeWalt, Milwaukee, and Ryobi titanium bits that failed on the same job.
Factory-direct construction holds diameter accuracy within -0.03mm, so the hole matches your planned size. The cobalt 5% content makes it harder than plain HSS, and the full grinding and hardening processes keep the edge biting. Round shanks fit standard chucks without slipping.
The honest catch: these bits are sharp but brittle. Reviewers point out they break easily under any side load — the strength of this set is the 15 spares in the plastic case. It is an ideal choice when you do a lot of 1/4-inch work. If you need a variety of sizes, the 29-piece Norseman above gives far more range for a higher budget.
Where it shines
- 15 identical spares for heavy single-size work
- 0.25-inch diameter with accuracy within -0.03mm
- Outperforms major-brand titanium bits on layered metal
Watch out for
- Snaps easily under side load — keep it straight
- Only one size; not a versatile set
Built for: anyone who repeatedly drills 1/4-inch holes in steel, stainless, or cast iron and wants spares ready.
Pass on it if: you need a range of sizes for different projects.
4. WildBossy M35 Cobalt Metric Drill Bits (19 Piece)
A 19-size metric range that turns a stubborn steel trailer into a quick afternoon job.
If your projects live in millimeters, this set covers 1mm to 10mm with the 19 most-used sizes. The M35 high-speed steel with 5% cobalt gives improved heat resistance over standard HSS, which matters when you push through stainless or cast iron. Shoppers say drilling over 30 holes in a steel utility trailer frame with a single bit after three other bits failed on just five holes — the bit still remained sharp.
The straight shank jobber design fits most standard chucks and offers a useful balance of reach and control. The 135-degree point helps alignment, and the 16-ounce weight keeps it manageable. Quality is the most-praised aspect, with sharpness close behind. The storage case has readable markings, which buyers appreciate when hunting for the right size mid-project.
The trade-off: durability gets mixed reviews — some find these bits sturdy, others say they are more fragile than expected, and a few question whether they are solid cobalt or coated. The manufacturer is upfront that stainless and hard metal need low speed, steady pressure, and cutting oil. This is not for concrete or masonry, so keep it to metal and soft materials.
Why it earns a spot: 19 metric sizes with real 5% cobalt content at a mid-range price, praised most for overall quality.
The honest note: follow the speed and oil guidance for stainless, or the thinner bits will not last.
5. STROTON Cobalt Drill Bit Set (17 Piece)
A 68 HRC cobalt set that carves stainless into long ribbons instead of grinding through it.
The 68 HRC Rockwell hardness, backed by 5% cobalt steel, lets the triple-ground edge slice stainless instead of rubbing through. That hardness is why the cutting edge, ground three times, slices stainless and hardened steel rather than slowly rubbing through. Buyers describe the first use as cutting through stainless like a hot knife through butter, and the 17-piece set covers 1/16-inch to 1/2-inch with duplicates of the fragile small sizes.
Quality is the most-praised aspect, with value for money close behind. The sharp edge cuts metal into long strips of iron chips rather than grinding dust, which means less heat and a cleaner hole. One owner drilled through 5/8-inch plate smoothly with nice ribbons, using the recommended slow speed and cutting oil. The split point at 135 degrees keeps the bit from walking on smooth steel.
The complaint pattern is about cutting performance and durability being mixed — some owners find bits unsuitable for certain steel work or prone to breaking. The 2.1x piece advantage over the 13-piece DelitonGude above means more spares, but the price runs higher. This is a mid-range set that behaves like a premium one on stainless, provided you respect speed and lubrication.
The strength
- 68 HRC hardness with triple-ground cutting edges
- Duplicates of the fragile small sizes
- Full 1/16″ to 1/2″ range in 17 pieces
The limit
- Mixed feedback on durability in harder steels
- Higher price than basic cobalt sets
Grab this for: stainless and hardened steel projects where a sharp, hard edge saves time.
Think twice if: you mostly drill soft steel and want maximum value per dollar.
6. IRWIN Cobalt Alloy Steel Drill Bit Set (15 Piece)
The three-flatted shank set that grips keyless chucks tight and walks through sheet steel without slipping.
The three-flatted shank grips keyless chucks tighter than round shanks, preventing slippage under load. It grips far better than round shanks, so the bit transfers full power to steel rather than spinning in the chuck. Buyers report going through 3/8-inch sheet steel like butter and using the progressive drilling method to extract sheared bolts with ease.
The redesigned 135-degree tip promotes long life, and the cobalt alloy steel resists the heat of hard metal. Quality is the most-praised aspect, with performance close behind. One owner broke three HSS drills on the same job before these cobalt bits finished it with just a drop of cutting oil and slow speed. The 11.2-ounce set stays light, and the stackable case with a clear lid keeps contents visible.
The honest catch: durability is mixed — some owners mention bits breaking during first use, and there is no 1/2-inch bit included despite the 15-piece count. The price runs higher than the 17-piece STROTON above, so you are paying for the chuck grip and the IRWIN reputation. It shines for anyone using a modern drill with a keyless chuck.
Best for: drill owners who hate chuck slippage and want a compact, travel-friendly cobalt set.
Keep in mind: durability reviews are split, so treat the small bits with care.
7. MACXCOIP M35 Cobalt Drill Bit Set (25 Piece)
The 25-size metric set that tops out at 13mm, ready for stainless and cast iron with a military-grade case.
This is the widest metric range in the lineup, jumping from 1mm all the way to 13mm in 0.5mm steps. The M35 cobalt steel with 5% cobalt is built for stainless steel, iron castings, copper, and aluminum, and the metal storage box beats flimsy plastic organizers. Buyers appreciate the sharp factory edges and report the bits staying sharp even after heavy use on thick metal bangle bracelets.
The 135-degree point and twist design give self-centering action to prevent walk-off, and the spiral flutes push chips and particles out fast. Quality is the most-praised aspect, with sharpness close behind. The metal case with size indexes makes it easy to sort, and the 16-ounce weight keeps the whole kit portable.
The manufacturer is clear this set is not for quenched bolts — hardened fasteners will defeat it. Durability gets mixed feedback, with the notable gripe being a bit that went dull halfway through one hole in 1/4-inch mild steel even with cutting oil. It is a premium-priced set, but the 25-piece coverage and metal case justify the jump for metric-focused workshops.
Why it stands out
- 25 metric sizes from 1mm to 13mm
- Durable painted metal storage case
- Sharp from the factory with 5% cobalt
The drawback
- Not meant for quenched or hardened bolts
- Premium price for the full range
Choose it for: metric workshop projects needing the complete 1mm-to-13mm range in one box.
skip it if: you work in imperial sizes or only drill soft steel.
8. DeWalt DW1969 Pilot Point Drill Bit Set (29 Piece)
A hybrid set with 21 bullet pilot points for clean starts and 8 split points for metal, all in one case.
This 29-piece set splits the difference: 21 pilot point bits from 3/16-inch to 1/2-inch for accurate free-hand drilling, plus 8 split point bits from 1/16-inch to 11/64-inch for metal work. The bullet pilot points make starting holes more accurate in wood and hardwoods, fitting Forstner center holes better than brad points, while remaining usable on metal. The gold ferrous oxide finish adds durability.
Quality is the most-praised aspect by a wide margin, with functionality second. Customers note the 6.35mm cutting diameter bits working well under many conditions, particularly for drilling thin metal. The case is a strong point — owners love the organized layout, and one even bought a second set as a Father’s Day gift because his dad admired the first.
The honest trade-off: these are not heavy-metal drilling bits. Reviewers point out the tips wear or lose their edge over time on metal, which is expected for a hybrid set. Durability and sharpness both get mixed feedback, with the smaller bits occasionally breaking. If your dominant material is wood but you occasionally need metal, this is the versatile pick. If metal is your main game, the Norseman above will outlast it.
Perfect balance for: the mixed-material user who drills wood and thin metal and wants clean starts without a center punch.
Not for: heavy steel or stainless drilling day in and day out.
9. DeWalt DW1369 Titanium Nitride Coated Set (29 Piece)
The titanium-coated pilot point set that starts on contact and stays sharp for hand-drilling mild steel.
The titanium nitride coating extends bit life and lets the pilot point start on contact for cleaner holes without a center punch. Shoppers say these work particularly well for hand drilling in mild steel, with less effort and better control than standard bits. The 29-piece range covers 1/16-inch all the way to 1/2-inch, with the tapered web providing greater durability to reduce breaking.
Quality is the most-praised aspect by a wide margin, with performance second and value for money third. The no-spin shanks grip chucks firmly, and the metal wall-mount case is a genuine upgrade over flimsy plastic boxes — owners love being able to hang it in the shop. One buyer calls these “hands down some of the nicest drill bits I’ve ever used.”
The recurring complaint is the case and the durability split. Some owners find the bits hard to remove and replace from the holder, and the painted size markings can wear off with use. Durability gets mixed feedback — some bits hold up well, others show issues under heavy stress. As a premium-priced set, it is excellent for clean, accurate holes in mild steel but is not a heavy-duty cobalt replacement.
What impresses
- Titanium nitride coating for longer bit life
- Starts on contact for cleaner holes
- Metal wall-mount case keeps all 29 sizes organized
What disappoints
- Painted size markings can wear off
- Bits can be difficult to remove from the holder
Best suited for: hand drilling clean holes in mild steel with minimal effort and maximum control.
Consider alternatives if: you regularly drill hardened or stainless steel — cobalt will serve you better.
Understanding the Specs
M35 Cobalt and the 5% Difference
M35 high-speed steel with 5% cobalt resists heat far better than plain HSS. When you drill metal, friction heats the tip past the point where ordinary steel softens. The cobalt keeps the edge hard so it keeps cutting. If you see “HSS” with no cobalt mention, expect faster dulling on stainless.
The 135-Degree Split Point
A split point means the tip has a secondary grind that lets it bite into metal immediately. A 135-degree angle is the standard for harder metals because it handles pressure without chipping. The practical win: your bit starts where you place it instead of skating sideways across a smooth steel surface.
FAQ
What is the difference between cobalt and titanium drill bits for metal?
Why does the 135-degree split point matter for drilling metal?
Do I need cutting oil when drilling metal?
Why do my drill bits keep breaking on metal?
Can I use wood drill bits on metal?
What is the difference between jobber length and other drill bit lengths?
How do I know which drill bit size to use before I tap threads?
Why do my pilot point bits skip or chatter on metal?
Will a 1/4-inch cobalt bit work in my standard drill chuck?
How many holes can I expect from a set of metal drill bits?
Final Thoughts: The Verdict
If you want one dependable pick, the drill bits for metal winner is the Norseman 44170 because its NAS 907B precision-ground geometry and gold oxide finish deliver years of heavy steel drilling with an edge that stays sharp. If you want budget-friendly stainless capability, grab the DelitonGude M35 13-piece set, which out-cuts brand-name titanium on bronze and stainless. And for the complete metric workshop range, the MACXCOIP 25-piece set from 1mm to 13mm in a metal case is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.