Chrome Vanadium steel impact sockets. Phosphate finish for added corrosion resistance. Suitable for use with impact tools. Supplied in storage case. Features & Benefits:Chrome Vanadium steel impact sockets.Phosphate finish for added corrosion resistance.3/8" & 1/2"Sq Drive.Includes 10 deep sockets.Suitable for use with impact tools. Contents: 3/8"Sq Drive Sockets; 8, 9, 10, 11, 12, 14, 15, 16, 17mm, 1/2"Sq Drive Sockets; 17, 19, 22, 30mm, 1/2", 9/16", 11/16", 13/16", 1", 1-1/8", 1/2"Sq Drive Deep Sockets; 13, 15, 17, 18, 19, 21, 22, 24, 27, 30mm, Extension Bars; 3/8" x 75mm, 1/2" x 75mm, Adaptor; 1/2"(F)-3/8"(M).Supplied in storage case.Lifetime guarantee*.Model No. AK681 Specifications: Model No AK681 Brand: Premier Contents: 3/8"Sq Drive Sockets: 8, 9, 10, 11, 12, 14, 15, 16, 17mm 1/2"Sq Drive Sockets: 17, 19, 22, 30mm, 1/2", 9/16", 11/16", 13/16", 1", 1-1/8" 1/2"Sq Drive Deep Sockets: 13, 15, 17, 18, 19, 21, 22, 24, 27, 30mm Extension Bars: 3/8" x 75mm