HSS Blacksmith Drill Bits with Reduced Shank, Dart, Sizes 13mm to 25mm
Dart HSS Blacksmith Drill Bits. Sizes 16.5mm to 25mm bits have a reduced shank size of 13mm 1/2". Sizes 13mm to 16mm bits have a reduced shank size of 10mm. 13mm x 150mm. The overall lengths of the drill bits are as follows (approx.).