IBX1484 Features: * Designed to remove broken studs, bolts, socket screws and fittings * Aggressive left hand spiral design for extra gripping power * 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 * Extractor size and recommended drill bit size are etched on each tool Recommended tap wrench: TR-88; use drill size: 5/32" removes bolts and screws: 7/32" - 9/32", 6 mm - 8 mm, No. 12. * Spiral Flute Screw Extractor - EX-3 Warranty: * Lifetime warranty does not cover abuse