9-Piece Spiral Screw Extractor SetAggressive left-hand spiral design provides extra gripping power. Designed for the removal of broken studs, bolts, socket screws and fittings. Constructed of high carbon steel for strength under stressful conditions. Extractor size and recommended drill bit size are etched on each extractor. Includes: (9) Sizes EX-1 thru EX-9, Pouch; Packing Type: Bulk; Weight: 3 1/2 lb.