Cobalt Drill Bits, Left-Hand, 5-Pc. Set

5 piece, left hand, cobalt drill bit set, selection of mechanics length drill bits ideal for creating pilot holes for screw extractors, high speed steel for increased heat resistance in drilling tough materials like alloy steel, hardened steel, stainless steel & cast iron, 135 degree split point tip eliminates walking & reduces feed pressure for easier penetration, set contains sizes: 5/64", 7/64", 5/32", 1/4" & 19/64", sizes match to Irwin spiral extractors in set TV #180-187, left hand bits require drill to run in reverse.