Irwin 67520 Jobber Drill Bit, 5/16 in Dia, 4-1/2 in OAL, Spiral Flute, 1-Flute, 5/16 in Dia Shank, Cylinder Shank

High-speed steel with black oxide treatment that reduces friction between bit and workpiece. Split point starts on contact in metal, wood and plastic; eliminates walking or skating when drilling into metal; 135 deg split point on all bits above 1/8 in ; jobber length.