Best Cobalt Drill Bits in 2027

This set leads our ranking. It is made from M35 cobalt, which the listing says contains 5% cobalt. That cobalt content resists heat, and heat is what dulls bits in stainless steel. For hard metals, heat resistance matters more than anything else on the spec sheet, so the material suits this keyword well.

The tip is a 135° split point. A split point tip bites into the metal without skating, so your starts land where you mark them. The listing also describes a self-centering point and a fully ground twist that clears chips. Sizes cover 29 fractional bits from 1/16" to 1/2" in 1/64" steps, 26 letter sizes, and 60 numbered sizes.

The set has 115 pieces and ships in a holder with size markings. That is a lot of bits to carry. Weight is not published by the maker, so check shelf space before you buy. No coating or warranty is listed either. Pick it for range, not for compactness.

DEWALT ranks second. The title says cobalt alloy steel with a pilot point, and the specs list a split point tip. A split point tip helps a bit start without wandering on smooth metal. The tip angle is not published, so we cannot say how steep the point is.

With 14 pieces, this is the smallest count on our page of 13 products. That limits you to fewer hole sizes. The listing does not state which sizes are included. If you need many diameters for stainless work, confirm the size list first. A short set suits repeat jobs at a few common sizes. That makes it more of a focused kit than a full range.

Storage is the focus. The case has a clear lid, a clip latch, and a bit-bar design that lets you remove bits and place them where you like. It connects to other accessory storage. The small case fits inside the Small and Medium ToughCase+, which is sold separately. The set weighs 1.02 lb.

STROTON ranks third and takes a different route. It uses M42 steel with 8% cobalt, listed at 68-70 HRC. Hardness like that points to good wear resistance on stainless steel and other hard metals. Most other sets here list M35 steel, so this one suits buyers who want a higher cobalt share.

The tip is a 135 degree split point, which helps the bit start where you aim. The 19 bits run from 1mm to 10mm in 0.5mm steps, and they are metric only. If your tap charts and fasteners are in in, you will have gaps. The set weighs 1 lb.

The listing does not mention a storage case, and our data does not show one. Plan on a separate holder, since 19 loose bits in lengths from 3.4cm to 13cm are easy to misplace. Small sizes suit sheet metal, brackets and pilot holes in hard stock. Choose it for fine metric work in hard metal.

CaRoller ranks fourth. The set is M35 cobalt with an amber coating, which the listing ties to wear resistance. The coating adds a surface layer on top of the cobalt steel. Cobalt is what handles the heat from drilling stainless steel, cast iron, and titanium alloy, all of which the listing names.

Sizes run from 1/16" to 1/2" in 29 bits, and the listing spells out every one, including 5/64", 3/32", and 7/64". That covers most in holes for bolts and pilot work. It is a practical range for most repair work. The 135 degree split point is described as self-centering, so the bit should not walk as you start the hole.

The case is a round cup-type holder with a built-in clip, so it attaches to a tool belt. That suits work on a ladder or in the field. The case keeps all 29 bits in one place. The maker does not publish weight, so portability is judged by the clip, not by a number.

Crosstar ranks fifth and departs from the usual recipe. It is M35 cobalt with 5% cobalt and a TiAlN coating that the listing rates to 1472°F (800°C). Effective drilling hardness is listed up to 60 HRC. That targets stainless steel, hardened cast iron, high-carbon steel, and titanium alloys. The coating is the main wear feature here.

Here is the catch for this keyword. The specs do not list a split point tip or a tip angle. Instead the listing relies on a three-flute design, which it says improves accuracy and reduces bit walk. If a split point is your first filter, other sets on this page list one.

The set has 21 bits from 1/16" to 1/2", a three-flat shank that grips the chuck, and a storage case. The case keeps all sizes together. The three-flat shank suits impact drivers and heavy drills. The listing notes the three-flute bits are meant for standard depth of cut. Weight is not published.