3/8" Dr. 7 Pc. Part Number: 1247MH GRE1247MH. Set contains one piece impact hex drivers. Impact Hex Bit Socket Set, 3/8 in.; Drive, 7 Piece, 4mm to 12mm, 4 in.; Long, in Blow Molded Case. They also allow up to 20% more torque to be applied than on other impact sockets.