The Sealey AK751 Bolt, Stud & Screw Extractor Set is suitable for professional workshop The Sealey AK751 is an 18 Piece Bolt, Stud and Screw Extractor Set supplied in a storage case and is suitable for professional workshop use. The stud type includes 3 internal rollers clamping down and gripping stud allowing removal/installation. The screw-type has left-hand threads for removing recessed bolts/studs. The bolt type features reverse spiral flutes which bite down on rounded off bolts. Features: Supplied in storage case Suitable for professional workshop 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 3 internal rollers clamping down and gripping stud allowing removal/installation Comprehensive set including Chrome Molybdenum screw and bolt extractors and Vanadium stud extractors Comes With: 1/2\"Sq Drive Stud Extractor Set: 6, 8, 10, 12mm 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 Specification:  Model No: AK751