Description
This is GRAFF universal step drill bit made of HSS high strength steel. It is a pyramidal drill bit which has a pitch of 2 mm and 9 drill levels (from 4 to 20 mm). The tool is has a cylindrical shank with a diameter of 8 mm for a conventional self-tightening or cam cartridge. When using this drill bit, you don’t need to sharpen it because it is equipped with special sharpening.
