3/8" Dr, 6Pt, SAE Deep Impact Set, 12Pc Sizes: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1. Made from high quality alloy steel (chrome-molybdenum).. Transfers the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength.. Allows up to 20% more torque to be applied than on standard impact sockets.. The shift in pressure allows us to reduce the socket wall thickness, increasing access to tight areas.. Molded Storage Case. 1213D