4-22mm Hex Cone Step Drill Bit Hole Cutter For Sheet Metal With Hole Enlargement
4-22mm HSS hex hole cutter cone step drill bit. Its step from 4mm to 22mm: 4mm,6mm,8mm,10mm,12mm,14mm, 16mm,18mm,20mm, 22mm. Unique structure, can open a variety of specifications of aperture. Step: 4-22mm (4,6,8,10,12,14,16,18,20, 22mm).