10 Best Drill Bits For Drilling Metal in 2026

An M35 cobalt alloy offers a strong balance of price and performance for general steel drilling, making these bits a practical upgrade from standard high-speed steel. According to expert round-ups, Milwaukee’s Red Helix cobalt bits have delivered excellent success, becoming a go-to choice for metal drilling with a cordless drill. This 29-piece set provides a reliable solution for working with steel and similar materials.

In a controlled test drilling stainless steel, the Milwaukee cobalt bits were included among several top brands, though the results of that specific comparison are not detailed. The research notes that non-cobalt bits from other brands failed to drill the same material entirely. For the majority of metal drilling tasks, this set is positioned as a balanced and effective option.

An 8% cobalt M42 alloy gives these bits a reported ten times longer life than standard bits, along with high heat resistance for drilling tough metals like stainless steel and cast iron. That material upgrade means they can handle repeated use in hardened alloys without softening quickly. The split point on larger bits helps start holes without skating, and the three-flat shank improves grip in the chuck under load.

Research comparing several brands shows the Bosch cobalt bits drilled 15 holes in a stainless steel test, while the leading performer drilled 135. This performance context is specific to that material and test setup. Compared to a smaller Spyder set, the Bosch provides more bits and a wider size range for about six dollars more, offering value for general hardened metal work.

The 5% cobalt alloy steel is the core feature here, giving these bits the hardness and heat resistance to tackle tough metals like stainless steel without softening prematurely. This set hits a sweet spot for the serious DIYer or mechanic who drills metal regularly but doesn’t want to invest in premium-tier bits. The 29-piece range in 1/64-inch increments means you’ll almost always have the exact size needed, and the 135-degree split point design helps the bit start cutting right where you intend, not skate across the workpiece.

The trade-off is in the shank design; it’s a standard round shank, not the three-flat style found on sets like the Bosch M42 Cobalt. That three-flat design virtually eliminates bit slippage in a drill chuck under high torque. For most drill press or hand drill applications, the IRWIN’s grip is sufficient, but for demanding, high-torque jobs, that’s the compromise you make. You’re getting sturdy cobalt performance and a very complete size selection in a single, organized case, which covers a lot of workshop needs efficiently.

A titanium nitride coating makes these bits last 2.5 times longer than non-coated versions, so you can drill more material before they wear out. This set is built for the user who reaches for an impact driver as often as a standard drill. Its 1/4-inch hex shank and impact-rated construction are specifically engineered to handle the concussive force of an impact driver, which reviewers note can snap lesser bits.

The 14-piece count offers a focused selection for common tasks, not a comprehensive shop assortment like the 29-piece Milwaukee Cobalt set. While the coating is durable, the bits are intended for drilling ferrous metal, wood, plastic, non-ferrous metal, cast iron, and stainless steel. For dedicated metal drilling with a standard drill, some users might consider a cobalt set, but for impact driver work, the Makita’s fortified design is the specific priority.

Its impact-rated hex shank is the key feature, allowing you to safely crank up the torque on a cordless driver without the bit slipping. This makes the Bosch TI9IM set a focused solution for anyone who drills metal primarily with an impact driver. The titanium coating and no-skate tip back that up, helping you punch through heavy-gauge steel with control and less heat buildup. It’s a purpose-built kit for the mechanic or fabricator who wants a drill bit set that lives in their impact driver’s case.

This set includes nine bits, which makes it a compact and portable assortment rather than a comprehensive workshop collection. It is designed for heavy-gauge and high-carbon steel, so it excels as the right bit for an impact driver when working on-site with that material. The other products list shows larger sets like the 29-piece Milwaukee Cobalt or 21-piece Bosch M42 Cobalt, which offer more sizes but are physically larger and heavier.

The DEWALT set’s standout feature is its patented bit-bar storage, a system that lets you pull bits out easily and reconfigure the case to fit your kit. For the tradesperson or serious DIYer whose drill index lives in a packed bag, this organization is a genuine time-saver. The clear lid and secure latch mean you can find what you need and trust it to stay put. It’s a solid choice for anyone who prioritizes keeping a professional-grade cobalt set organized and ready to go.

This DEWALT set focuses on organization with its patented bit-bar and connectable case, so you can customize storage and see your bits at a glance. The clear lid and clip latch keep contents secure yet accessible, a practical advantage over loose bits in a drawer. Its compact size fits inside certain larger DEWALT tool cases, which helps consolidate a toolkit.

A Rockwell hardness of 68 HRC means these bits can handle the friction of drilling into stainless steel without dulling quickly. That solid 5% cobalt construction is what lets you push them up to three times faster than a standard HSS bit in hard metals. For a home shop tackling projects with steel or cast iron, this set delivers the speed and durability that makes a cordless drill feel more capable.

This set covers a comprehensive range of sizes in 1/64-inch increments, which is excellent for precise bolt clearance holes. The trade-off is the standard jobber length, which won’t reach as deep as some specialized sets. Research mentions excellent success with Milwaukee’s Red Helix cobalt bits for metal drilling, and the STROTON bits are also made from solid M35 cobalt material.

A 29-piece set with a 135-degree split-point tip means you can start drilling into steel or aluminum immediately without the bit skating across the surface. For the DIYer or occasional metalworker, this IRWIN set covers the essential sizes from 1/16-inch up to 1/2-inch in fine increments, all housed in a sturdy metal case. The high-speed steel construction and protective oxide finish are built to handle general metal drilling without fuss, making it a straightforward and reliable choice for a workshop drawer.

Its construction from premium high-speed steel allows extended drilling in tough materials, a feature that suits general-purpose metalworking. A 135-degree split-point tip starts quickly with less applied force and resists wandering on curved surfaces. Compared to cobalt options like the Bosch M42 set, the material offers less heat resistance, which some users find impacts longevity during intensive use on very hard metals.

The 3-flats shank reduces spin-out in the chuck on sizes larger than 3/16-inch, so you get a more secure grip when drilling bigger holes. A 135-degree split point tip helps reduce walking, which keeps the bit from skating off your mark at the start. This high-speed steel set is meant for plastic, wood, and metal, making it a straightforward choice for general drilling tasks.

High-speed steel construction allows use in plastic, wood, and metal, offering versatility across common materials. A tapered web design aims for extreme durability and resists breakage under normal use. Compared to a cobalt set like the Bosch M42, this material is positioned for general-purpose work rather than specialized applications in metals like stainless steel.

A 15-piece pack of identical 1/4-inch cobalt bits means you can burn through several on a tough job without running out mid-project. This is the set for the metal fabricator or serious DIYer who drills a lot of holes in steel and stainless steel. The M35 cobalt composition and 135-degree split-point are built for that specific, punishing workload, keeping the bit centered and reducing the chance of snapping. You get a full box of workhorse bits designed to be consumed.

The trade-off is a complete lack of size variety. Every bit is 1/4-inch, so you can’t step up or down for different fastener sizes. For a general workshop needing a range of holes, a comprehensive set like the IRWIN M35 Cobalt Drill Bit Set with its 29 different sizes is a more versatile starting point. The RCINDUS assortment is a specialist’s bulk supply, not a starter kit.