Drilling into metal is a fundamentally different task than boring through wood or drywall. The hardened surface resists cutting, generates intense heat, and destroys standard bits in seconds. A dedicated bit for drilling metal must have the correct geometry, material, and heat tolerance to shear through steel, stainless, or cast iron without glazing over or breaking at the tip.
I’m Rikta — the co-founder and writer behind Gadgets Feed. I’ve spent years analyzing drill bit metallurgy, point geometry specs, and real-world cutting performance across hundreds of sets to separate the bits that last from the ones that burn up on the first hole. (And Homer 🐱 watched me test bits from behind a pair of safety glasses, unimpressed by the racket).
Whether you’re mounting steel shelving, repairing automotive parts, or fabricating in a home shop, choosing the wrong twist drill leads to frustration and wasted material. This guide breaks down the essential specs, the best sets at every tier, and the exact details that matter when you need the best bit for drilling metal.
How To Choose The Best Bit For Drilling Metal
Selecting a metal drill bit isn’t about picking the most expensive set. It’s about matching material composition, point geometry, and coating to the specific hardness of the metal you intend to cut. A bit that chews through mild steel will dull instantly on hardened tool steel, and a general-purpose titanium set can fail on stainless after three holes.
Material: Cobalt vs Titanium vs HSS
Cobalt high-speed steel (M35 or M42 grade) is the gold standard for drilling into stainless steel, cast iron, and other tough alloys because the 5-8% cobalt content maintains hardness at red-hot temperatures. Titanium nitride (TiN) coatings reduce friction and extend edge life, but the underlying steel is often standard HSS, so once the coating wears, performance drops fast. Straight high-speed steel (HSS) bits work fine on mild steel and aluminum but lack the heat resistance for hardened metals.
Point Geometry: 135° Split Point
A 135-degree split point is the single most important geometry feature for metal drilling. Unlike the 118-degree standard point found on wood bits, the 135-degree angle with a split (self-centering) tip reduces walking, cuts thrust force, and allows the bit to penetrate without a pilot hole in many cases. If you see a bit labeled with a 118-degree point today, it is not optimized for metal work.
Coating and Finish
Black oxide provides mild corrosion resistance and helps retain cutting oil on the surface during operation. Gold oxide and bronze oxide finishes are indicators of higher-temperature treatments used on jobsber-length bits. Titanium nitride (TiN) bright gold coating boosts surface hardness to 2,300 HV and reduces friction, but it’s only as good as the steel underneath — budget TiN bits often use soft HSS that deforms before the coating wears out.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Norseman 44170 | Premium HSS | Aerospace-grade precision steel work | M2/M7 HSS, NAS 907B spec | Amazon |
| DeWalt DW1369 | TiN Coated | Multi-metal and wood with pilot point | 135° split point, TiN coated | Amazon |
| Kendo 29PC Cobalt | M35 Cobalt | Stainless steel and cold rolled steel | 5% cobalt, bronze steam surface | Amazon |
| CaRoller M35 Cobalt | M35 Cobalt | Heavy-duty steel, I-beams, and studs | Amber coating, 3 flute design | Amazon |
| Milwaukee Shockwave TiN | Titanium | General workshop and occasional metal | 3-flute design, 135° cutting angle | Amazon |
| DeWalt DW1969 Pilot Point | Pilot Point | Thin metal and wood counterboring | Pilot point tip, gold ferrous oxide | Amazon |
| JEFE HEX 115Pc Cobalt | M35 Cobalt | Industrial shop with full size range | 115 pcs, fractional/letter/wire | Amazon |
In‑Depth Reviews
1. Norseman Drill Bits 44170 Ultra Dex Type 240-UB
The Norseman 44170 set represents a different philosophy — premium high-speed steel engineered to meet NAS 907B aerospace standards, not a cobalt or TiN-coated consumer product. Each bit is precision ground from Hi-Molybdenum tool steel (M2/M7) with a 135-degree split point, gold oxide finish, and full jobber length. Users report drilling 100 half-inch holes in quarter-inch steel plate with a single bit and zero dulling.
The 29-piece range from 1/16 to 1/2 by 64ths covers every fractional size a metalworker needs. The black oxide flute treatment aids chip flow in steel, while the uncoated body reduces galling when drilling aluminum. This bit for drilling metal does not rely on a coating to survive — the steel itself is the performance layer.
The storage case is compact and functional, though less flashy than molded plastic organizers. For anyone doing regular fabrication, machine work, or automotive repair, the Norseman set offers repeatable, predictable cutting that cheaper sets cannot sustain. It’s an investment that pays back in fewer broken bits and cleaner holes.
Why it’s great
- Aerospace-grade HMS steel meets NAS 907B standards for industrial precision
- Maintains sharpness through high hole counts in steel plate without resharpening
- 135-degree split point bites immediately without pilot hole walking
Good to know
- Not cobalt alloy — do not expect extended performance in high-temperature super alloys
- Case is basic compared to premium competition; bits can shift during transport
2. DEWALT Titanium Nitride Coated Drill Bit Set, 29-Piece (DW1369)
DeWalt’s DW1369 combines a titanium nitride coating with a pilot point geometry that starts contact instantly without walking. The 135-degree split point is ground into the bit, but the real differentiator is the No-Spin shank design that prevents chuck slippage under high torque loads — a common frustration when drilling into stainless or thick steel.
The 29-piece set runs from 1/16 to 1/2 inch and comes in a rugged metal storage case with a wall-mountable bracket. The TiN coating extends edge life significantly compared to standard HSS, though it’s a coating-dependent improvement rather than a metallurgical one. Users praise the case’s durability and the clean holes produced in both metal and wood.
Note that the pilot point only activates from 3/16-inch bits and larger. The smaller bits use a standard split point. This bit for drilling metal works excellently on mild steel, aluminum, and even thin sheet metal, but struggles to maintain edge life on hardened steel or heavy stainless applications without frequent resharpening.
Why it’s great
- No-Spin hex shank eliminates bit slippage in the chuck during heavy drilling
- Rugged metal case with wall-mount design outlasts plastic alternatives
- Pilot point on larger sizes produces clean, accurate holes without wandering
Good to know
- TiN coating wears over time; performance drops once the coating is gone
- Small bits lack the pilot point feature, limiting self-centering on fine work
3. KENDO 29PCS Cobalt Drill Bit Set (1/16”-1/2”)
The KENDO 29-piece set delivers genuine M35 cobalt high-speed steel at a price point that undercuts most competitors by a wide margin. With 5% cobalt content alloyed into the steel, these bits maintain cutting edge hardness at elevated temperatures far better than titanium-coated HSS alternatives. The bronze steam surface treatment provides a combination of hardness and toughness for wear resistance.
The 135-degree split point is self-centering, reducing thrust and improving penetration on hard metals. Users report drilling 75 holes in quarter-inch cold rolled steel with no performance loss or need for resharpening — a strong indicator of consistent heat treatment. The set covers 29 fractional sizes from 1/16 to 1/2 inch in a metal index storage box.
The storage case is functional but users note the tray can be finicky when trying to reseat bits. If you’re looking for a cobalt set that performs on stainless steel, cast iron, and titanium alloys without breaking the budget, this is the most cost-effective entry point. This bit for drilling metal is a genuine workhorse for home shop and light industrial use.
Why it’s great
- Genuine 5% M35 cobalt alloy maintains hardness through high-heat stainless cutting
- High hole count retention — 75 holes in cold rolled steel without resharpening
- 135-degree split point provides consistent self-centering without a pilot hole
Good to know
- Included index case has plastic tray inserts that can be difficult to manage
- Not suitable for hardened tool steel; requires EDM or carbide for that use case
4. CaRoller Cobalt Drill Bit Set 29-Piece M35
CaRoller’s M35 cobalt set distinguishes itself with an amber coating that reduces friction and heat buildup during high-speed drilling. The 135-degree split point tip design prevents walking on smooth metal surfaces, and the 3-flute geometry — unusual for a jobber set — aids in chip evacuation and reduces binding in deep holes. The set covers the same 29 fractional sizes from 1/16 to 1/2 inch.
Users have tested these bits on steel I-beams, aluminum studs, and 1/8-inch stainless plate, reporting that they “cut like butter” when used at slow speeds with cutting oil. The crucial operating note: excessive pressure or high RPM ruins bits quickly. Running a drill press at 300 RPM with light feed generates long spiral chips without overheating the cutting edge.
The cup-type round storage case with a built-in belt clip sets this apart for on-site work — it attaches to a tool belt and keeps bits within immediate reach. This bit for drilling metal is a strong choice for construction pros and framers who need to drill into steel studs, beams, and heavy-gauge sheet metal regularly.
Why it’s great
- Amber coating reduces friction and heat significantly during extended drilling runs
- 3-flute design improves chip evacuation compared to standard 2-flute bits
- Portable cup-type case with belt clip is ideal for job site portability
Good to know
- Requires slow speeds and cutting oil for best results on stainless and hard steel
- Some chipping observed on cutting edge after heavy use; resharpening may be needed
5. Milwaukee 48-89-4630 Kit TiN Shockwave (15-Piece Titanium)
Milwaukee’s Shockwave TiN set brings the brand’s well-regarded heat treatment and 135-degree split point into a compact 15-piece kit with a titanium nitride finish. The 3-flute design is identical to the larger sets, providing improved chip extraction over traditional 2-flute bits. The set runs from 1/16 to 1/2 inch with the most commonly used fractional sizes.
This bit for drilling metal is a great choice for the general workshop where you need one versatile set for occasional metal work, wood, and plastic. Users note the bits cut cleanly and hold an edge well for their category, though the titanium coating is a surface-level improvement — the underlying steel is standard HSS, so performance in hardened metals is limited.
One caveat from real use: the smaller bits are noticeably short, which can make it difficult to drill completely through a standard 2x board when using them for pilot holes. If your work is primarily on sheet metal, thin plate, and soft metals, this set offers the right balance of quality and size. For heavy steel penetration, a cobalt set is a better investment.
Why it’s great
- Milwaukee’s consistent heat treatment delivers reliable edge retention across the set
- 3-flute geometry helps clear chips faster in deep holes compared to 2-flute bits
- Compact 15-piece kit covers the most common sizes without excess bulk
Good to know
- Smaller bits are shorter than standard jobber length, limiting through-hole depth
- TiN coating on standard HSS is not equivalent to cobalt alloy for high-heat work
6. DeWalt Accessories DW1969 29Pc Pilot Pt. Set
The DeWalt DW1969 set uses a pilot point tip design that combines the self-centering action of a brad point with the cutting profile of a twist drill. The 8 smallest bits (1/16 to 11/64) feature a split point, while the 21 larger bits (3/16 to 1/2) use the pilot point geometry. The gold ferrous oxide finish provides corrosion resistance and helps the bit retain cutting oil.
This set is optimized for work on thin metals and wood — the pilot point excels at creating clean holes in sheet metal without the bit skating across the surface. Users report the set works well on plywood, hardwood, and mild steel when used at the appropriate speed. The case design has been updated with a metal flip-up clasp after earlier versions used a difficult plastic latch.
For dedicated heavy metal drilling, the tips can wear down over time, particularly on stainless or abrasive materials. This bit for drilling metal is best suited to the home DIYer or woodworker who occasionally drills into thin-gauge steel and wants a reliable, organized set. It’s not designed for industrial throughput or repeated use on hardened alloys.
Why it’s great
- Pilot point design on larger bits provides exceptional self-centering in thin metal
- Gold ferrous oxide finish helps retain cutting oil on the bit surface
- Updated case with metal clasp is more durable than earlier plastic versions
Good to know
- Tips wear faster on stainless and hardened steel compared to cobalt or TiN sets
- Small bits (under 3/16) use standard split point, not the pilot point geometry
7. JEFE HEX 115 Pcs Cobalt Drill Bit Set
The JEFE HEX 115-piece set is the ultimate comprehensive solution for any serious metalworking shop. It covers 29 fractional sizes (1/16 to 1/2 by 64ths), 26 letter sizes (A to Z), and 60 wire sizes (#1 to #60) — all made from M35 cobalt high-speed steel with a 135-degree split point. Every single bit in the set contains 5% cobalt, not just a subset, ensuring consistent performance across the entire size range.
The bronze oxide finish provides heat resistance and cutting oil retention. Users report the bits are sharp out of the box and hold up well through repeated use on mild steel, stainless, and cast iron. The set’s indexing in a durable iron case with an organization chart makes it easy to find the right size quickly — essential when you’re working in industrial maintenance or fabrication.
The downside is the cost, which reflects the raw material volume — 115 cobalt bits is a significant investment. However, for anyone who needs to drill precise holes in hard metals across multiple size ranges regularly, this set eliminates the need to buy individual bits or multiple smaller sets. This bit for drilling metal set is the endgame for a well-equipped machine shop.
Why it’s great
- Full size coverage — fractional, letter, and wire sizes in a single organized set
- Every bit is M35 cobalt, not just the larger sizes, for consistent heat resistance
- Durable iron storage case with indexed layout keeps the shop organized
Good to know
- High upfront investment; only justified if you regularly need the full range
- Wire gauge bits smaller than #60 may be fragile if used with heavy drilling pressure
FAQ
What RPM should I use for drilling into mild steel?
Do I need cutting oil for drilling metal?
Can I use wood drill bits for metal?
Final Thoughts: The Verdict
For most users, the best bit for drilling metal overall is the KENDO 29PCS Cobalt Drill Bit Set because it delivers genuine M35 cobalt performance at a mid-range price point, handling stainless steel and cold rolled steel with excellent hole-count retention. If you need aerospace-grade precision and run a machine shop, grab the Norseman 44170 for its NAS 907B standard HSS construction and unmatched edge life in general steelwork. And for the comprehensive shop that needs fractional, letter, and wire sizes all in one organized set, nothing beats the JEFE HEX 115 Piece Cobalt Set.