IBX1137 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 * 10 PIece Spiral Extractor and Drill Bit Combo Pack Includes: * Set includes pouch Set includes spiral flute screw extractors in sizes: EX-1, EX-2, EX-3, EX-4, EX-5, and drill bits in sizes 5/64", 7/64", 5/32", 1/4" and 19/64". Warranty: * 30 day warranty on material and workmanship