Counterbore HSS, 3 flutes, point 180°, according to standard DIN 375, with morse taper shank. Diameter of pilot pin for holes fine-tuning. Brand Hepyc with reference 5137.
For countersinking holes in steel, stainless steel, cast iron, non-ferrous metal and superalloys., for inner hexagon screws DIN 912 / 6912 / 7984 and cylinder screws DIN 84.