Most cobalt drill bits for hardened steel and other metals have tips with stepped and split points that bite into the metal, ...

Moly drill bits work well with mild steel. Cobalt bits are expensive and best choice for the abuse common in farm shops, but…drill bits by definition are “consumable items.” ...

Used in a hand drill, it's not hard to break through the coating and then you just have a plain HSS bit.<BR><BR>I've used cobalt bits to drill the case hardened head on allen bolts for safety wire ...

Diablo's Metal Demon™ Drill Bits for Mild, Hardened and Stainless Steels are manufactured with high-speed steel and a coating that cuts rather than grinds and delivers precise, fast, clean holes.

Industrial-duty versions of twist drill bits are made from various forms of high-speed steel (such as a cobalt-molybdenum alloy, M42), and these bits may also have a wear-resistant nitride (or ...

DeWalt 14-Piece Cobalt Alloy Steel Drill Bit Set, $29 (was $51) on Amazon Courtesy of Amazon This drill bit set is well-rounded, and its hard plastic carrying case makes it portable and keeps ...

Diablo's Metal Demon™ Drill Bits for Mild, Hardened and Stainless Steels are manufactured with high-speed steel and a coating that cuts rather than grinds and delivers precise, fast, clean holes.