Product DescriptionFeature:100% Brand New.11pc Nut Bolt Extractor Socket And Tommy bar SetThe specially hardened sockets with corrosion protection are designed for the removal of damaged bolts, screws and nuts.The Twist socket design allows for a secure connection onto the rounded-off fastener to be extracted.The innovative spiral profile digs itself into the head of a damaged screw or nut, allowing it to be easily loosened.3/8″ square drive for use with socket wrench or impact wrench.These broken bolt extractors have Black oxide surface provides greater strength and durability and prevents corrosion. Specification:Material: Chromium Vanadium Steel ( has more good wear resistance and toughness than Chromium-molybdenum steel , the former is commonly used in Socket , the latter used for Screwdriver)Size:The set includesSAE sizes -1/4”, 5/16”, 3/8”, 7/16”, 1/2”, 9/16”, 5/8”, 11/16”, and 3/4”.Metric sizes – 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 17mm, and 19mm.Driver size: 3/8″ Package included:9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 19mm twist sockets, 7.8mm straight rod and Case