Designed to remove broken studs, bolts, socket screws, and fittings, the IRWIN HANSON Screw Extractor and Drill Bit Set, 35 Piece, features an aggressive left hand design for extra gripping power. Easy out style spiral flutes embed themselves deeper into the metal as the tool is turned so grip increases as resistance increases. This handy set includes EX-1, EX-2, EX-3, EX-4, EX-5, EX-6, multi-spline extractors in sizes: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16, 15/32, 1/2"; and drill bits in sizes: 5/64", 7/64", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 19/64", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2", and a plastic case.