Manufactured from hardened and tempered Chrome Molybdenum steel with a manganese phosphate finish for resistance to corrosion. 3/8""Sq drive impact spline socket bits with an additional locking 1/2""Sq drive quick change adaptor. Supplied in an EVA storage tray. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. Manufactured from hardened and tempered Chrome Molybdenum steel with a manganese phosphate finish for resistance to corrosion. 3/8""Sq Drive impact spline socket bits with an additional locking 1/2""Sq drive quick change adaptor. Contents: 3/8""Sq Drive Sockets; M6, M8, M10, M12, M14, M16, M18, 1/2""Sq Drive Quick Change Adaptor. Supplied in an EVA storage tray. Lifetime guarantee*.