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made of chrome molybdenum steel for loosening damaged screws and nuts suitable for impact wrenches the innovative spiral profile digs itself into the head of a damaged screw/nut allowing to loosen it securely special twist sockets, 12.5 mm (1/2") drive: 17 - 18.5 - 20 - 21.5 - 23 - 24.5 - 26 mm surface finish: black burnished