Comprehensive set including Chrome Molybdenum screw and bolt extractors and Vanadium stud extractors. Screw-type has left-hand threads for removing recessed bolts/studs. Bolt type features reverse spiral flutes which bite down on rounded off bolts. Stud type includes three internal rollers, clamping down and gripping stud, allowing removal/installation. Suitable for professional workshop. Supplied in storage case. Features & Benefits: • Comprehensive set including Chrome Molybdenum screw and bolt extractors and Vanadium stud extractors. • Screw-type has left-hand threads for removing recessed bolts/studs. • Bolt type features reverse spiral flutes which bite down on rounded off bolts. • Stud type includes three internal rollers, clamping down and gripping stud, allowing removal/installation. • Contents: 3/8"Sq Drive Bolt Extractor Set; 10, 11, 12, 13, 14, 15, 16, 17, 19mm, Screw Extractor Set; M14-M18, M11-M14, M8-M11, M6-M8, M3-M6, 1/2"Sq Drive Stud Extractor Set; 6, 8, 10, 12mm. • S