Combined Centre Drill, #4, 1/8 in. Drill, 5/16 in. Shank

Centre drill (combined drill and countersink) with 60° straight conical form, double ended and cylindrical body, 4 with 1/8" drill diameter, a body diameter of 5/16" and an overall length of 2-1/8", according to ANSI standard to produce form A centre holes, cobalt based HSS-E and bright finish for machining free machining, plain carbon and alloy steel and grey cast-iron.