HSS countersink for through holes, DIN 373 M, FORUM HSS Production standard 3 cutting edges Shank MK 2–3 Spiral flute Fixed guide pin For countersinking according to DIN 74 For countersinking hexagon head screws according to DIN 912, 6912, 7984 and straight cylinder head screws according to DIN 84 in all types of ferrous and non-ferrous metals as well as in plastics
