IBX1614 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: 7/64" removes bolts and screws: 5/32" - 7/32", 4 mm - 6 mm, No. 6 - No. 12. * Spiral Flute Screw Extractor - EX-1 Warranty: * Lifetime warranty does not cover abuse