A225BS4 Centre Drill - 60°

Centre drill (combined drill and countersink) with 60° straight conical form, double ended and cylindrical body, size BS4 with 1/8" drill diameter, a body diameter of 5/16" and an overall length of 2.1/4", according to BS 328 standard to produce form A centre holes, HSS and bright finish for machining free machining, plain carbon and alloy steel and grey cast-iron