Step drill with titanium coating for precise drilling in sheet metal, alloys and plastic with a maximum thickness of 4 mm. Equipped with clear markings in 2 mm. increases. Quick change 6.35 mm. (1/4") 6-sided shafts. HSS 3x 4,6,8,10,12mm. 4,6,8,10,12,14,16,18,20mm. 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm.