10 Best Drill Bits For Aluminum in 2026

Cobalt construction allows these bits to withstand the very high drilling temperatures generated by stainless steel and other hard metals, which contributes to their longer service life. The no-skate split-point tip enables clean, precise holes and accurate starts by preventing the bit from wandering on the material surface. For bits 3/16 inch and larger, the three-flat shank design promotes a better grip in the drill chuck to guard against slipping during operation.

The trade-off is in the assortment. With 21 pieces, you get a solid range from 1/16″ to 1/2″, but it’s a leaner kit compared to something like the 29-piece Milwaukee Red Helix set. That means you might not have every fractional sixty-fourth increment, which could matter for precise tap drill sizes. For most aluminum fabrication, however, the core sizes are all here, packed in a slim, organized case that doesn’t hog drawer space. It’s a premium, no-nonsense set that does its job without fuss.

Makita’s B-65399 set features a 1/4-inch hex shank that locks directly into an impact driver, so there’s no need for a separate chuck adapter. Its titanium nitride coating is rated to last two and a half times longer than non-coated bits, which helps maintain a sharp cutting edge through repeated use. The 135-degree split point geometry is designed for faster starts and reduced walking, allowing the bit to bite quickly into materials like metal or wood.

This 14-piece set offers fewer individual bits than many larger mechanics sets, such as the 29-piece Milwaukee Red Helix. While the titanium coating provides durability for general use, drilling frequently into hardened materials like stainless steel might call for a specialized cobalt set, such as the Bosch CO21. The hex shank design and impact rating make it a direct match for impact drivers when working on the listed materials, including ferrous metal, wood, and plastic.

Cobalt alloy bits maintain their edge at high temperatures, so they last longer when drilling tough materials like stainless steel. The Milwaukee Red Helix set includes 29 pieces in a range of sizes, providing a comprehensive selection for metalworking tasks. This makes it a suitable choice for a fabricator or shop regularly working with hard metals where standard bits would fail.

Portability is the main consideration here. For dedicated aluminum work where heat buildup is less extreme, the Bosch CO21 set offers a similar cobalt and three-flat shank design in a more compact, 1.1-pound case. In contrast, the Milwaukee set is built for the bench, not the back pocket, offering its durability where it matters most against the hardest metals.

This 29-piece High Speed Steel set includes a 135° split point tip to reduce walking and a 3-flats shank to reduce spin-out in the chuck. The black and gold coating helps prevent rust and wear, while the tapered web design is for durability and resisting breakage. It’s a core set for drilling plastic, wood, and metal, offering reliable performance for general shop tasks without a premium price.

Material choice is the key distinction. While HSS is cost-effective, it doesn’t shed heat or hold an edge in hardened steel like the cobalt bits from Bosch or Milwaukee. If your projects frequently mix aluminum with stainless or cast iron, you’ll push these bits to their limit. For dedicated, pristine aluminum work, a sharper geometry or specialized coating might be necessary to avoid the melting issue some owners report.

A tri-flatted shank is the key feature of the Aleric Titanium Step Drill Bit Set, locking each bit solidly into a drill chuck to prevent slippage during use. This secure fit, combined with double cutting blades designed for smoother drilling, allows progression through the stepped sizes. The set is suitable for DIY or general building tasks on aluminum, wood, and plastic, where the multiple steps can create relatively clean holes without constantly changing bits. Its three bits offer steps including sizes from 1/8 inch to 3/4 inch.

You trade dedicated bit selection for the step drill’s graduated convenience. For a single, precise hole size in thicker aluminum, a dedicated cobalt bit like the Bosch CO21 would be a more durable and efficient choice. But for a project needing multiple hole sizes in thin materials, like installing vents or running conduit, these Aleric step bits will save you time and tool changes.

Its 29-piece range from 1/16″ to 1/2″ in 64th-inch increments is the standout feature. This gives you a near-continuous selection of inch sizes, making it a fantastic set for anyone who frequently needs to match or enlarge existing hole sizes in aluminum or other metals without switching between sets. The cobalt construction and 135-degree split point are built for the heat and abrasion of hard metals, so they’ll hold an edge longer in aluminum than standard bits. This set is for the meticulous fabricator or machinist who works primarily in imperial measurements and needs a specific size, not just the closest approximation.

The set features a three-flat shank to prevent spinning, though sizes 11/64″ and smaller have a round shank. This mixed design still functions for multi-material drilling, but other sets like the Bosch CO21 use a uniform three-flat shank. The Drill America set includes a round storage case and is intended for drilling in hardened metals like steel and brass.

The 5% cobalt alloy is the key here. Aluminum is soft but gummy, and it builds heat fast, which can weld chips to a standard bit and ruin your work. This alloy’s higher heat resistance means you can push harder for longer without losing the edge, a real advantage in production runs or thicker stock. The 135-degree split point starts cleanly on curved surfaces, and the full 1/64-inch increment range means you’ll have the exact size for tapping or clearance holes without forcing a bit.

The set’s case measures over a foot wide, requiring more storage space than more compact options. This bulk may be less convenient for portable tool storage compared to a set like the Bosch CO21. The heavy-duty web construction and cobalt alloy are designed for strength and durability in heavy use.

This high-speed steel bit promises to drill three times longer than competitors and twice as fast as cobalt, which is a bold claim for anyone burning through bits on hard alloys. The set is built for users who value domestic manufacturing and need a durable, fast-cutting bit for materials like stainless steel and titanium. Its reduced mechanics length adds rigidity, and the flatted shanks are a thoughtful touch for modern cordless drills.

Champion’s Brute Platinum set uses a mechanics-length design, which is shorter than a standard jobber-length set like the DEWALT Black & Gold. This reduced length adds strength and rigidity for drilling hard metals, but it limits the depth you can reach in a single pass. The self-centering 135-degree split point and tapered web geometry are engineered to prevent the drill from walking, so your holes stay precise in a drill press or on standard stock. According to the manufacturer, the high-speed steel construction offers more flex than generic cobalt drills, which can mean fewer bits snap under lateral pressure.

A 13-piece set covering 1/16″ to 1/4″ makes this a specialist for precision metalwork and small-scale fabrication. The M35 cobalt steel and 135-degree split point are a serious combination for aluminum. This geometry lets you start a hole cleanly without walking and maintain a sharp edge through repeated cuts. This set suits machinists or detailed hobbyists who spend more time at the drill press than with a heavy-duty cordless, tackling projects where exact hole size matters more than brute force.

The range is focused on smaller diameters, stopping at 1/4″. For tasks needing bits larger than a quarter-inch, a second set would be required. Compared to broader 29-piece cobalt sets, this one serves a specific, smaller scale.

Drilling up to a 3/4-inch hole is possible with the largest bit in this IRONANT set, a capacity useful for running conduit or tubing through sheet metal. Its step design allows precise hole enlargement to multiple common sizes without swapping tools, saving time on a project panel. The self-centering tip helps prevent walking on the workpiece, and dual flutes clear chips to keep the cut clean in recommended materials like aluminum and iron.

Specialization defines this set, as the manufacturer advises against using these bits on stainless steel or wood. For drilling a wider variety of materials, including stainless steel, other products like the Bosch CO21 or Milwaukee Red Helix sets are listed as cobalt options. Within its stated scope for sheet metal, however, this set’s focused design and included storage bag offer a practical solution for creating stepped holes.