Description
Centre drill (combined drill and countersink) with 60° straight conical form, double ended and cylindrical body, size BS7 with 5/16″ drill diameter, a body diameter of 3/4″ and an overall length of 3.1/2″, 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
