10 Best Quality Drill Bits For Stainless Steel 2026 in the United States

The BOSCH CO21B 21-Piece Assorted Drill Bit Set is designed specifically for drilling into tough materials like stainless steel, cast iron, and titanium. Its cobalt M42 alloy material includes 8% cobalt, which greatly improves durability and heat resistance—meaning these bits stay sharper and last longer than standard ones when working on hard metals. The bits feature a 135-degree split point tip, helping you start holes easily without the drill bit slipping, so you can work more precisely and with less effort.

For enhanced grip and control, bits sized 3/16 inch and larger come with a three-flat shank design that fits securely in most drill chucks. The thick web-helix and hardened surface add extra stability and toughness during demanding drilling tasks. This set covers a wide range of sizes from very small (1/16 inch) up to 1/2 inch, making it versatile for various project needs. The included plastic case helps you keep the bits organized and protected.

While the plastic case is lightweight, it may not be as rugged as metal cases for rough transport. If you need larger sizes beyond 1/2 inch or specialized coatings, this set might not fully cover those. However, for anyone working regularly with stainless steel or other hard metals, these Bosch cobalt bits offer a strong combination of toughness, precision, and size variety to get the job done efficiently.

The Drill America 29 Piece Cobalt Stepped Point Drill Bit Set is a solid choice for drilling stainless steel and other hard metals. Made from cobalt, these bits are known for their durability and ability to hold up well under heat, which is important when working with tough materials. The gold oxide coating helps reduce friction and heat buildup, extending the bit's lifespan. The 135-degree split point tip design improves accuracy by starting the hole cleanly without wandering, making it easier to drill precise holes in hard metals.

The set includes a good range of sizes from 1/16" up to 1/2", covering most common drilling needs. The shank design is mostly 3-flat, which prevents slipping in the drill chuck, except for the smallest sizes that have round shanks. This design is practical but less ideal for very high-torque applications where all bits having flat shanks would be preferable. While the bits perform well on hard metals, the gold oxide coating is less durable than some more advanced coatings like titanium nitride or black oxide for extended heavy use.

The bits are jobber length, which is a standard length but may not be ideal if you need extra-long bits for deeper holes. The included plastic round case helps keep bits organized but is basic and may not withstand heavy workshop wear. This set suits DIYers and professionals who occasionally work with stainless steel and other hard materials and want a versatile, reasonably priced bit set with reliable performance.

The MACXCOIP Cobalt Drill Bit Set is designed to cater to various drilling needs, especially when working with stainless steel and other hard materials. With 29 different sizes ranging from 1/16" to 1/2", it offers great versatility, making it a solid choice for both professionals and DIY enthusiasts. The M35 cobalt construction enhances durability and sharpness, allowing users to make precise cuts without excessive wear and tear. The 135-degree point tip and twist design are excellent features, as they improve cutting efficiency and reduce the chances of the bit walking off during use.

One of the standout attributes of this set is its ability to handle not just stainless steel but also cast iron, copper, aluminum, and even wood, which broadens its usability. The drill bits are also nicely housed in a metal index storage box, making organization and access easy, a thoughtful touch for those who appreciate keeping their tools tidy.

There are a couple of points to consider. While the cobalt material is robust, it can be more brittle than other types of steel, which means extra care is needed to avoid breaking bits when drilling harder materials. Additionally, some users might find that the bits can heat up quickly if not used with proper technique, so it's advisable to use cutting fluid or a slower drilling speed to mitigate this. The product is manufactured in China.