General description Comprehensive 18-piece set including Chrome Molybdenum screw and bolt extractors as well as Vanadium stud extractors, designed for professional workshop use. The set is supplied in a convenient storage case. Technical specifications Model No.: AK751 Contents: 3/8" Sq Drive Bolt Extractor Set; sizes 10, 11, 12, 13, 14, 15, 16, 17, 19mm Screw Extractor Set; sizes M14-M18, M11-M14, M8-M11, M6-M8, M3-M6 1/2" Sq Drive Stud Extractor Set; sizes 6, 8, 10, 12mm Lifetime Guarantee* Usage The screw-type extractors feature left-hand threads for removing recessed bolts and studs, while the bolt-type extractors have reverse spiral flutes that grip rounded-off bolts. The stud-type extractors include three internal rollers that clamp down and grip the stud for easy removal and installation. Other information