US PRO TOOLS 13pc M35 Cobalt Left Hand Drill Bit Set 1.5 - 6.5mm 7079
These engineer quality, left hand spiral drill bits are made from M35 steel with 5% Cobalt for longer life. HSS M35, 5% Cobalt. Drill a pilot hole in the dead centre of the fastener. Set the drill to reverse and a low speed.