4-20mm HSS M2 Materials
Total 9 Steps:4mm 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm
Shank Type:Triangle Shank
Step drill bit is a drill bit that has the tip ground down to a different diameter.The transition between this ground diameter and the original diameter is either straight, to form a counter bore, or angled, to form a countersink.