This 49-piece set includes screw extractor and drill bits designed to remove broken studs, bolts, screws, and fittings. It features an aggressive left-hand design for enhanced gripping power and easy-out style spiral flutes that embed themselves for increased grip. The set includes left-hand cobalt drill bits, multi-spline screw extractors, spiral screw extractors, and a nut remover set. It also comes with a hex adaptor that fits both 3/8 and 1/4 inch sizes.