4-12/4-20/4-32mm M35 5% Cobalt Step Drill Bit Set Tapered HSS-CO HSS Drill Bit Kit Spiral Groove Hex Shank for Stainless Steel

4-12/4-20/4-32mm M35 5% Cobalt Step Drill Bit Set Tapered HSS-CO HSS Drill Bit Kit Spiral Groove Hex Shank for Stainless Steel