Insize INSTCS12 12.4mm 3 Flute HSS M2 Countersink Screwdrivers~Keys 11/32" x 7/16"

11/32" x 7/16"

3 x M12 × 1

Drop forged heat treated steel componentry gives long service life

Hole Side: 9

Polished chrome electroplated finish for corrosion resistance

Insize INSTCS12 12.4mm 3 Flute HSS M2 Countersink Screwdrivers~Keys 11/32" x 7/16"Insize Countersinks are made from 100% M42 Cobalt High Speed Steel. They are used for countersinking holes and deburring in a wide variety of materials including ferrous and non ferrous metals. The triple, wide angled fluted design is self centering allowing the user to provide a heavy, 90 degree, chamfer to the entrance of a drilled hole. This chamfer may also be required to allow the correct seating of a countersink head screw or to provide the lead