10 Best Drills For Stainless Steel in 2026

Cobalt construction designed for very high drilling temperatures is what makes this set a reliable workhorse for stainless steel. The Bosch CO21 bits are built to survive the heat that quickly dulls standard bits, giving you a tool that punches clean, precise holes in tough materials without constant resharpening. It’s the right foundation for a shop tackling a mix of stainless projects, light-gauge metal, and even wood or plastic, all from one organized case.

Made from cobalt, the Bosch CO21 set is designed for drilling into hard materials like stainless steel and cast iron, and it handles general work in lighter metals, wood, and plastic. The bits feature a no-skate split-point tip for accurate hole starts and a three-flat shank that improves grip in the chuck, especially on sizes 3/16 inch and larger. For demanding tasks in stainless steel, these bits are built to withstand very high drilling temperatures and offer a lifespan up to four times longer than standard high-speed steel bits.

With sizes from 1/16 inch to 1/2 inch in 1/64-inch increments, this set means you’re far less likely to be caught without the exact bit you need for a hole in stainless steel or other tough metals. It’s for the serious DIYer or pro who tackles varied projects and values having a complete range of fractional sizes on hand. The M35 cobalt construction and 135-degree split point are built for the heat and hardness of stainless, so you can drill confidently without the bit skating off your punch mark.

The trade-off for that comprehensive range is a physically large case, which won’t fit in a compact tool bag. You get breadth over specialized convenience compared to a focused set like the NordWolf stubby bits. If your work demands a specific hex-shank format for impact drivers, you’ll need to look elsewhere. For a traditional drill press or chuck, however, this set covers an enormous amount of ground from pilot holes to large fasteners in one organized package.

An 8% cobalt alloy defines these bits, delivering ten times the life of a standard bit according to Bosch. The M42 material offers high heat resistance for tackling stainless steel, cast iron, and titanium. A surface-hardened tip helps penetrate tough materials, while the thick web-helix design provides additional stability in demanding applications.

Research mentions indicate these bits can wear out more quickly when used on work-hardened steel or without cutting fluid. For a wider assortment in a similar alloy, the Bosch CO21 set offers more pieces, but this 14-piece kit covers the core fractional sizes from 1/16 inch to 1/2 inch.

The Milwaukee Cobalt Red Helix Drill Bit Set includes 29 pieces, providing a wide range of sizes for various tasks. Its cobalt construction is commonly associated with drilling hard metals. The included case measures 9.9 by 9.5 by 3.5 inches, so it occupies a defined space on a workbench or shelf.

The trade-off is bulk. That protective case is sizable and the set has some heft, so it’s not a compact kit for a service bag. If your work demands extreme portability, a focused set like the NordWolf M35 Cobalt Stubby Drill Bit Set, with its hex shank and tiny footprint, might be a better fit for the tool belt. For a stationary workshop, Milwaukee’s comprehensive offering is hard to beat.

A 31-degree helix on the parabolic flute efficiently clears chips without being overly aggressive, which is ideal for drilling deep holes in materials like metal and wood. The black oxide coating helps resist corrosion for longer-lasting bits in shop conditions, and the 135-degree split-point tip prevents walking on hard surfaces. This 21-piece set is designed for general-purpose drilling in metal, hardwood, softwood, PVC, and fiberglass.

The trade-off is the material. These are high-speed steel bits, not cobalt. For frequent drilling in hardened stainless, a dedicated cobalt set like the Bosch CO21 will hold its edge longer and withstand higher heat. Think of the DeWalt set as a versatile workshop workhorse for mixed materials, not a specialist for exclusively tackling tough alloys day in and day out.

The four-flute design and TiAlN coating are the core advantages here. That combination means this bit can chew through thin-gauge stainless and sheet metal with less heat buildup and chatter, living up to its ‘hot knife through butter’ claim. It’s a specialist tool perfectly suited for the metal fabricator or auto restorer who frequently needs clean, burr-free holes in ductwork, enclosures, or vehicle panels without changing bits for every size.

The clear trade-off is its fixed application range. You’re buying it for sheet work up to an eighth of an inch thick, and it can’t drill a hole smaller than 3/16 inch or larger than 7/8 inch. For a wider range of hole sizes in thicker material, you’d look at a comprehensive set of standard twist bits like the Bosch CO21. But for the specific job of stepping through common sizes in thin metal, this AugTouf design is remarkably efficient.

A total length under two and a half inches is what makes these bits special. That stubby profile is the key to getting a drill into corners and recesses where a standard-length bit simply wouldn’t fit. For anyone regularly working on machinery, installing hardware in deep cabinets, or tackling automotive projects, this design solves a specific and frustrating problem. The M35 cobalt construction and 135-degree split point mean they’ll bite into stainless and hard metals without wandering, provided you keep the speed low and use pressure.

This set includes five imperial sizes ranging from 3/32″ to 5/16″, which covers several common needs. Compared to other cobalt sets like the Bosch CO21 with 21 pieces, the NordWolf offering has a more focused selection. The bits are packed in a plastic storage box imprinted with their sizes, and the box has a sliding clip on the back for hanging on a pegboard.

The Titanium Aluminum Nitride (TiAlN) coating withstands cutting temperatures up to 1472°F, which drastically reduces heat buildup during operation. This extreme heat resistance translates directly into a longer tool life compared to standard coatings when drilling tough materials like stainless steel or titanium alloys. The M35 cobalt steel and triple-flute design, which improves chip ejection by approximately 40%, provide the foundation for that advanced coating’s performance.

The triple-flute geometry is recommended for standard depth of cut applications, so it may not be optimal for very deep-hole drilling. Also, the bits from 1/16″ through 7/64″ use a two-flute design, meaning the triple-flute benefits for chip ejection and hole finish apply only to sizes 3/32″ and up. For a cobalt set with a three-flat shank but without the TiAlN coating, the Bosch CO21 Cobalt Drill Bit Set is another option.

A 19-piece set covering 1mm to 10mm gives you a ready solution for nearly any metric fastener or precision hole in sheet metal. That’s why it’s the logical pick for anyone working with imported machinery, European hardware, or any project where metric is the standard. The M35 cobalt construction provides the necessary heat resistance for the slow, steady drilling stainless steel demands, and the straight shank ensures compatibility with common workshop drills.

The jobber-length design is a practical compromise, offering good control but less depth capacity than an aircraft-length bit. If you need to punch through thicker stock, you’ll need to step up or consider a set with longer flutes. For a premium alternative focused on reduced walking and higher speed steel, the Bosch CO14B M42 set uses a different cobalt formulation and includes a case, but you trade away the full metric range.

A pack of four identical 17/64″ bits made from 5% cobalt M35 steel is built for a specific, repetitive job. The 135-degree split point will bite into stainless steel without skating, and the factory’s full-grind process means each bit is a precise match for the next. This makes it a solid choice for a production task or a project requiring dozens of holes at the same diameter, where you want spares on hand without buying a full set.

The obvious trade-off is the complete lack of size variety. You’re buying a specialized tool, not a versatile kit. For drilling stainless steel at multiple sizes, a comprehensive set like the Bosch CO21 offers far more range. But if your work calls for a specific 17/64″ hole in tough materials, this pack delivers focused durability and consistency right out of the case.