Irwin 63221 21-Piece Cobalt High Speed Steel Drill Bit Sets

Constructed of M-42 8 percent cobalt high speed steel for super abrasive resistance in tough metalsHeavy duty spiral flute design produces faster chip ejectionShorter cutting lips reduce torque for drilling in high tensile strength materials.135-degree split point reduces feed pressure for easier penetration without work hardening

21-piece set in metal index case includes drill bit sizes 1/16" through 3/8" in 1/64" increments