Hanson 52402 Extractor Ex-2 Spiral, for Tap Die Extraction,Irwin,52402" /> Screw extractor set is designed to remove broken studs, bolts, socket screws and fittings Screw extractors feature an aggressive left-hand spiral design for extra gripping power IRWIN screw extractor size and recommended drill bit size are etched on each tool Spiral flutes are designed to embed themselves deeper into the metal as you turn the tool, so as the fastener resistance increases, the extractor's grip increases Recommended for use with TR-88 tap wrenches and 7/64-inch drills