Premium grade HSS Counterbores with straight shank & pilot. For producing countersinkings for cylindrical head screws, thread-cutting screws Ideal for burr- and chatter-free deburring and countersinking. Suitable for use on structural grade steels, cast iron & non-ferrous metals. Suitable for use with any 1/2″ chuck. Can be fitted into appropriate Weldon Adapter for use with variable speed Magnetic Drills. Best results at low cutting speeds. Conform to DIN 373
