Metric M35 Cobalt Step Drill Bit for Stainless Steel Hard Metal 4-32mm/15 steps
Premium M35 6% Cobalt Steel ,66-69 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life. (2)This step drill bit is made of. Hand Drill 2mm. Drill Press 5mm.