G1258.0X3.3 Counterbore - 180°

Counterbore with 3-flutes, diameter 8.00mm with an overall length of 71mm and a flute length of 14mm and 5mm straight shank, according to DIN 373 standard to produce a counterbore with the aid of a non-drilling pilot with a diameter of 3.30mm for a pre-hole tapping diameter M4, HSS with standard bright finish for machining free machining and plain carbon steel, wrought and copper or copper alloys