Description:
31M | From 0.3mm to 1mm, with a pitch of 0.05mm, 20 steps, in addition to 0.38, 0.52, 0.78, and 0.82mm steps | 663-651 micro drill kit | 11 steps, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.35, 0.4, 0.45, and 0.5 mm | 484-8452 # # # High speed steel, cobalt high-speed steel, and hard alloy
