Klutch Impact Socket Set - 3/8in. and 1/2in. Drives, 38-Pc. Made of chrome vanadium steel for strength 3/8in. drive sockets: SAE 5/16in.-3/4in.; metric 8mm-19mm 1/2in. drive: SAE 7/16in.-1in.; metric 10mm-24mm 3/8in. M to 1/2in. F drive adapter Plastic case