7 Top Picks: Best Drill Bits for Steel You Need Now
Whether you’re a seasoned fabricator or a weekend DIYer, drilling clean, precise holes in steel can make or break a project. The wrong bit can overheat, dull quickly, or leave jagged edges that compromise structural integrity and waste time. That’s why selecting the right drill bit—one built to handle the hardness and heat of steel—is essential for safety, efficiency, and a professional finish. In this guide we’ve tested dozens of options and distilled the results into the top seven drill bits that consistently deliver sharp cuts, long life, and reliable performance on steel products. Read on to discover which tools deserve a spot in your toolbox.
Must-Have Drill Bits for Steel – Expert Picks
We’ve tested countless options, and these seven drill bits consistently deliver precision, durability, and performance when tackling tough steel applications.
7. MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 Jobber Length
The MACXCOIP Cobalt Drill Bit Set delivers professional‑grade performance in a compact, 13‑piece kit. Each bit is forged from M35 high‑speed steel, giving it the hardness and heat resistance needed to tackle stainless steel, hardened metal, cast iron, wood, plastic, and even softer alloys like copper and aluminum. The set spans sizes from 1/16″ to 1/4″, covering every common drilling need while the 135° split‑point tip and precision twist geometry ensure fast, self‑centering entry and efficient chip evacuation. All bits are polished and hardened for long‑lasting sharpness, and they’re housed in a rugged indexed case that keeps every size organized and ready for the job.
Pros
- Versatile size range (1/16″‑1/4″) eliminates the need for multiple kits.
- M35 cobalt construction offers superior durability and heat resistance for drilling hardened metals and stainless steel.
- Fast, accurate cutting thanks to the 135° split‑point tip and self‑centering design, reducing walk‑off and improving productivity.
Cons
- The set is optimized for soft‑to‑medium hard materials; extremely hard alloys may still require a dedicated carbide bit.
- The case, while sturdy, adds a slight bulk that may be unnecessary for users who only need a few bits on the go.
6. MACXCOIP Cobalt-29PC Drill Bit Set
The MACXCOIP Cobalt Drill Bit Set delivers professional‑grade performance in a compact, organized package. Crafted from M35 high‑speed steel, each of the 29 bits combines cobalt’s heat‑resistance with a 135° split‑point tip, allowing clean, fast cuts in hardened metals such as stainless steel, cast iron, and copper, while also handling softer materials like wood, plastics, and aluminum. The twist‑design shank self‑centers to reduce walk‑off, and the polished, hardened inserts maintain sharpness for long‑term use. Sizes range from 1/16″ up to 1/2″, covering virtually every common drilling need, and the included metal index storage box with size labels keeps the set tidy and ready for quick selection on the job site.
Pros
- Versatile size range – 29 increments from 1/16″ to 1/2″ eliminates the need for multiple sets.
- Durable M35 cobalt construction – Handles both tough alloys and softer substrates without losing edge.
- Efficient cutting geometry – 135° point and twist design speeds up drilling and improves chip evacuation.
Cons
- Limited to job‑site and workshop use – The small metal case is sturdy but may not suit large‑scale inventory storage.
- No metric sizes – Users who work primarily with metric drills will need a separate set.
5. Metric M42 Cobalt Drill Bits
The Metric M42 8 % Cobalt Twist Drill Bits set is engineered for the toughest drilling tasks. Made from premium M42 cobalt steel (68‑70 HRC), each bit delivers exceptional heat resistance, wear resistance and chip control, giving you a long‑lasting tool that stays sharp even in high‑speed applications. The 3‑step cutting geometry—split‑point, 135° angle and optimized flute design—handles stainless steel, hardened alloys, aluminum and plastics with ease. Because the edge stays razor‑sharp, the bits slice metal into long, clean strips of chips instead of grinding it down, allowing you to drill three to five times faster than standard HSS bits. The set includes 19 sizes from 1 mm to 10 mm in 0.5 mm increments, with lengths matched to each diameter for optimal rigidity and chip evacuation.
Pros
- Superior durability – M42 cobalt steel resists heat and wear, extending tool life.
- High drilling speed – 3‑step design lets you work 3‑5× faster, reducing overall cost per hole.
- Versatile size range – 19 pieces cover most metric drilling needs in a single, organized kit.
Cons
- Higher upfront cost – Cobalt bits are pricier than standard HSS, though the long‑term savings often offset this.
- Brittleness at extreme temperatures – Like all cobalt tools, they can become more fragile if overheated; proper cooling is recommended for prolonged use.
4. Crosstar M35 Drill Bit Set
The Crosstar M35 Cobalt Drill Bit Set is built for the toughest metal‑working jobs. Each bit is forged from M35 cobalt high‑speed steel (5 % cobalt), giving the strength to cut hardened cast iron, stainless steel, high‑carbon steel, and titanium alloys up to 60 HRC. A nanometer‑thin TiAlN (Titanium Aluminum Nitride) coating protects the cutting edge from temperatures as high as 1472 °F (800 °C), dramatically reducing heat buildup and extending tool life far beyond standard TiN‑coated bits.
The set’s hallmark is its triple‑flute geometry, which delivers a smoother hole finish, up to 40 % faster chip ejection, and tighter dimensional accuracy with far less bit walk. For maximum torque transfer, every bit features a precision‑machined three‑flat shank that locks securely in the chuck, eliminating spin‑out even under heavy‑duty impact.
With 21 sizes ranging from 1/16″ to 1/2″, the collection covers more than 90 % of common metal‑drilling tasks. The smallest sizes (1/16″‑7/64″) retain a two‑flute design for delicate work, while bits 3/32″ and larger adopt the high‑performance triple‑flute design.
Pros
- Exceptional hardness handling – M35 cobalt steel drills through hardened metals up to 60 HRC.
- Extended durability – TiAlN coating resists extreme heat, cutting tool wear dramatically.
- Improved accuracy & speed – Triple‑flute design gives cleaner holes, faster chip removal, and less bit walk.
Cons
- Higher price point – Premium materials and coatings make the set more expensive than basic HSS bits.
- Limited to metal – The specialized geometry and coating are optimized for metal; not ideal for wood or plastics.
3. Toolant Cobalt 21pc Drill Bit Set
The toolant Cobalt Drill Bit Set Pro is built for anyone who needs to conquer hardened metal, stainless steel, and other tough alloys without the frustration of dull or wandering bits. This 21‑piece collection spans sizes from 1/16″ up to 1/2″, giving you the flexibility to tackle everything from delicate pilot holes to larger clearance drills. Each bit is forged from high‑grade cobalt and finished with a titanium aluminum nitride (TiAlN) coating that pushes surface hardness to 89 HRC, delivering exceptional heat resistance and staying sharp even under prolonged use. The bullet‑point tip is sharpened for self‑centering accuracy, dramatically reducing walk‑off and ensuring a clean, precise entry every time. Packaged in a sturdy case, the set is ready for on‑site jobs or a well‑stocked workshop, and the 90‑day warranty provides peace of mind—if you’re not satisfied, toolant will refund or replace the set.
Pros
- Ultra‑hard TiAlN coating – maintains cutting edge and resists heat buildup for faster, cleaner drilling.
- Bullet‑point tip design – self‑centering, minimizes wandering, and delivers pinpoint accuracy.
- Comprehensive size range – 21 bits cover 1/16″ to 1/2″, eliminating the need for multiple sets.
Cons
- Cobalt material can be more expensive than standard steel bits, which may be a consideration for casual DIY users.
- Limited to metal – the set isn’t optimized for wood or plastic, so you’ll need a separate bit collection for those materials.
2. BOSCH CO14B Metal Drill Bits Set
The BOSCH CO14B 14‑Piece Assorted Set delivers professional‑grade performance in a compact, travel‑ready case. Each bit is forged from M42 cobalt alloy (8 % cobalt) and heat‑treated for a surface‑hardened tip, giving a lifespan that’s up to ten times longer than standard HSS bits. The thick web‑helix design adds rigidity, while the three‑flat shank provides a secure grip in most drill chucks. This set covers every common diameter from 1/16″ to 1/2″, making it ideal for drilling stainless steel, cast iron, titanium, light‑gauge metal, and aluminum without sacrificing speed or accuracy.
Pros
- Exceptional durability & heat resistance – M42 cobalt and surface‑hardened tips stay sharp even in high‑temperature applications.
- Superior stability – Thick web‑helix and three‑flat shank reduce wobble, delivering clean holes in tough materials.
- Comprehensive size range – 14 sizes in a single, rugged case means you’re always prepared for the job at hand.
Cons
- Higher price point – The premium alloy and tooling cost more than basic HSS sets.
- Specialized focus – Optimized for metal; not the best choice for frequent wood or plastic drilling.
1. DEWALT DW1361 Drill Bit Set
The DEWALT DW1361 21‑piece drill‑bit set delivers professional‑grade performance in a compact, tough‑case package. Each bit is coated with titanium nitride and features a precision‑engineered pilot point that starts on contact, eliminating the need to “walk” the bit and producing cleaner, more accurate holes. The shank is designed without a spin‑relief groove, giving you a solid, non‑slipping grip in the chuck, while the tapered web adds extra strength to resist breakage during heavy‑duty use. Sizes range from 1/16‑inch up to 1/2‑inch, covering most common drilling tasks in wood, metal, and plastics.
Pros
- Longer life & cleaner holes – TiN coating + pilot point starts on contact for smooth entry.
- Increased durability – Tapered web and no‑spin shank reduce breakage and wobble.
- Comprehensive size range – 21 bits from 1/16″ to 1/2″ in a rugged, portable case.
Cons
- Limited to standard drill sizes – No specialty or extra‑large diameters included.
- TiN coating wear – While durable, the coating can diminish after extensive high‑speed use, requiring replacement of heavily worn bits.
Buying Guide
When selecting drill bits for steel, the material composition, geometry, and coating are critical to ensure clean cuts and long life. A good set balances cutting efficiency with durability, while fitting your drill and budget.
- Material and coating – high‑speed steel (HSS) with titanium or cobalt coating resists heat and wear.
- Tip geometry – split‑point or 135° angles start quickly and reduce walking on hard metal.
- Size range and shank type – metric and imperial sizes with a sturdy, straight shank fit most drills and reduce wobble.
- Build quality and tolerance – precision‑ground bits maintain roundness, providing consistent hole diameter.
- Price and warranty – compare cost per bit and look for a warranty that covers premature wear.
By focusing on these factors you can choose bits that drill steel cleanly without frequent replacement, delivering reliable performance and value. Investing in a reputable brand now saves time and money on future projects.
Frequently Asked Questions
What type of drill bit is best for drilling steel?
Cobalt‑alloy (M35 or M42) bits are the top choice. They contain 5‑8 % cobalt, which gives them superior heat resistance and hardness, allowing them to cut through hardened steels without losing sharpness. High‑speed steel (HSS) bits work for mild steel, but they wear out faster. For occasional light work, HSS with a titanium nitride (TiN) coating can be adequate, but for frequent or tough jobs, go straight to cobalt.
How do I choose the right size and coating for steel drilling?
- Diameter: Pick a bit that matches the hole size you need; oversizing will require a reamer.
- Length: Use a full‑length (extra‑long) bit for deep holes to keep the cutting edge engaged.
- Coating:
- TiN or TiAlN reduces friction and extends life on HSS bits.
- Black oxide offers mild lubrication but less durability than TiN.
- Cobalt bits usually don’t need additional coating; their alloy already provides heat resistance.
When in doubt, a slightly smaller pilot hole (using a 1/8‑ to 1/4‑in. bit) followed by the final size can reduce stress on the bit.
What are the best practices to prolong the life of drill bits when working with steel?
- Use proper speed and feed: For 1/4‑in. cobalt bits, keep RPM around 500–800 RPM; increase feed pressure rather than speed.
- Lubricate: Apply cutting oil, WD‑40, or a dedicated metal‑drilling lubricant to reduce heat and chip buildup.
- Peck drilling: For deep holes, pull the bit out every few inches to clear chips and let it cool.
- Sharpness check: If the bit starts “wandering” or produces ragged shavings, it’s dull—sharpen or replace it.
- Secure the workpiece: A stable clamp prevents vibration, which wears bits faster.
Following these steps will keep your drill bits cutting cleanly and extend their service life.
Conclusion
When drilling steel, the most reliable results come from matching the bit’s material and coating to the alloy, choosing a geometry that maximizes chip evacuation, and maintaining proper speed and feed rates. A high‑speed steel or cobalt core, often enhanced with TiN, TiAlN or carbide coating, will resist wear while delivering clean holes. Consistent use of cutting fluid reduces heat, prolongs tool life, and improves surface finish. By paying attention to these fundamentals—bit composition, edge angle, lubrication, and machine settings—users can achieve precision, efficiency, and durability in every project, regardless of the steel’s hardness, and overall productivity for your operations.