Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.7 Best Drill Bit Set For Stainless Steel | No More Chipped Edges

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The COMOWARE set earns the top spot thanks to its proven track record in heavy stainless steel and cast iron. Multiple long-term users report drilling dozens of holes in heavy-gauge stainless without significant dulling, a testament to its 5% M35 cobalt composition and precise 135-degree split point. The shank design incorporates three flats on bits 3/16-inch and larger, providing excellent grip in keyless chucks under high torque.

Users consistently note the exceptional sharpness out of the box, cutting through materials that would immediately destroy standard HSS bits. The included metal storage case is functional, though some users have reported the indexing insert arriving damaged in transit — a minor quality control gripe for an otherwise outstanding product. The 21-piece range covers 1/16-inch to 3/8-inch in 1/64-inch increments, a thoughtful spread for most metalworking tasks.

For the mid-range price, this set delivers performance that rivals more expensive options. It handles stainless steel sheet, pipe, and bar stock with consistent chip formation when used at the correct speed with cutting oil. The bits maintain their cutting edge across multiple projects, making this the most balanced choice for anyone regularly working with hardened metals.

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STROTON’s 21-piece set distinguishes itself with 1/64-inch incremental sizing from 1/16-inch up to 3/8-inch. This precision stepping matters when you need a specific hole diameter for fasteners or clearance fits in stainless steel fabrication. The bits are made from true 5% M35 cobalt with a 68 HRC rating, and users report cutting hundreds of holes in 5/8-inch steel with minimal wear when using proper technique.

The storage case is a standout feature — constructed from Q235 cold-rolled steel with a smooth hinge mechanism and tight bit clamps. The 3-flat shank design on bits 3/16-inch and larger ensures zero slippage under load. One user noted that the rivets holding the indexing insert to the case arrived failed, but this appears to be an isolated manufacturing issue that doesn’t affect the bits themselves.

Several reviews emphasize the importance of using cutting oil and slower drill speeds to maximize the lifespan of these bits. A user drilling 16 holes through 5/8-inch steel and 60 through 3/16-inch steel reported almost no visible wear, which speaks to the material quality. The set is a strong mid-range option that balances price with real-world cutting ability in stainless steel.

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The Irwin 316015 set is a familiar name among professional tradespeople. Its cobalt alloy steel construction and redesigned 135-degree tip provide reliable penetration through stainless steel, though the 15-piece selection is more limited than other options in this guide. The three-flatted shank is a key feature — it locks securely into keyless chucks, preventing the bit from spinning under the heavy torque required for stainless.

Users consistently mention the need for slow drill speeds and generous cutting fluid to get the best performance. One reviewer drilled through 3/8-inch steel plate using only a handheld drill and cutting fluid, reporting that the bits performed well. The set includes multiple small-size bits (the sizes most likely to break), which is a practical design choice. The transparent lid and stackable case are handy for job site organization.

The main trade-off is value. At the premium end of the pricing spectrum and with only 15 pieces, you’re paying for Irwin’s brand reputation and consistent quality rather than the highest piece count. The bits hold an edge well and are fully capable for occasional stainless work, but professionals drilling stainless regularly may want a larger set for more size options.

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The CaRoller set offers the widest size range in this guide at 29 pieces, covering from 1/16-inch all the way up to 1/2-inch. This makes it a compelling option if you need a single set for multiple hole diameters. The bits are made from W4 high-speed steel with a black oxide finish, not cobalt, which means they are less suited for heavy-duty stainless work compared to the M35 options above.

User reviews confirm this distinction. One reviewer drilled 30 holes in a steel I-beam with a single bit, noting significant wear by hole 30. Others report that the bits handle mild steel and aluminum well but require very slow speeds and cutting oil for stainless steel and will dull faster than cobalt bits. The 135-degree split point geometry does reduce walking, and the round straight shank works fine in standard chucks.

This set is best for users who need a broad size range for occasional stainless work but primarily drill softer metals, wood, or plastic. The expandable plastic case is functional and organized. If your primary material is thick stainless plate, a cobalt set will serve you better, but for general shop use with the occasional stainless job, the 29-piece coverage is hard to beat.

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STROTON’s 17-piece kit is a slightly more compact version of their larger set, but it maintains the same M35 cobalt material rated at 68 HRC. The bits feature a triple-ground cutting edge and 135-degree split point, designed for drilling stainless steel, hardened steel, and cast iron. The set includes duplicates of the most commonly used sizes (1/16-inch, 3/32-inch, 1/8-inch, and 1/4-inch), which is a thoughtful touch for fragile small bits.

A 76-year-old woodworker with extensive experience rated this the best drill bit set he had ever owned, praising its ability to stay sharp for clean holes in steel and iron. The company offers a free replacement warranty, which adds confidence. However, some users report brittleness in bits under 3/16-inch, with six out of ten breaking within six months of light use on thin metal studs. The manufacturer did honor a full refund in that case.

The plastic storage case has tight bit clamps and a secure closure, keeping bits organized and protected. This set occupies a solid mid-range position — it offers genuine cobalt performance at a reasonable price, but the smaller bits may be more prone to breakage than some competitors. It’s best for users who prioritize the larger bit sizes and want the warranty backup.

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The WildBossy set is the most budget-friendly option in this guide that still uses genuine M35 cobalt steel. It includes 20 pieces from 1/16-inch to 1/2-inch, with a 135-degree split point and a titanium surface finish. The 3-flat shank on larger bits helps with chuck grip, and the included plastic storage case is adequate for organization.

User experiences are mixed, which is typical for entry-level cobalt sets. One review describes the bits drilling through thin stainless steel “like butter” with the correct slow speed, while another reports that about half the set wouldn’t cut at all and some bits snapped immediately. This inconsistency suggests quality control varies between units. The bits that do work well are capable of drilling through stainless, but you may need to discard a few duds.

This set is best suited for someone on a tight budget who needs occasional stainless capability. The potential for inconsistent quality means it’s not ideal for critical jobs or professional use. If you get a good unit, it performs admirably for the low price, but the risk of receiving a flawed set is higher here than with more expensive options.

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For users working with metric fasteners and European machinery, the COPOUIXR set fills a specific gap that fractional-inch sets cannot. It includes 19 sizes from 1.0mm up to 10.0mm in 0.5mm increments, made from 5% cobalt HSS with a 135-degree split point. The metal storage box is sturdy and clearly marked with each size, making selection quick.

Reviews highlight the bits’ toughness when drilling through steel, with one user noting they cut through steel “with no problem whatsoever.” The split point design helps with positioning, but the manufacturer recommends using a center punch on smooth curved surfaces because the bits are not self-centering. Some reviewers use this set primarily for 3D print hole clearance, which speaks to its precision in softer materials as well.

The 0.5mm incremental sizing is both a strength and a limitation. It provides fine resolution for precision work but skips some sizes that fractional sets include. The bits are sharp and durable for their budget-friendly price, though they are not designed for heavy industrial use. A good choice for metric enthusiasts and those who need precise metric dimensions for stainless steel projects requiring ISO-standard hole sizes.