SUNEX TOOLS 3/8 in. Dr. Metric Impact Socket Set (51-Piece)This is an impact Socket set. It has 51 Pieces. It is 3 8 in. drive. Includes 6 point shallow, deep and universal impact sockets from 7 mm 22 mm, 3 in. extension and 3 8 in. drive universal joint 3 8 in. drive x 1 4 in. hex shank adapter included for use with cordless impact tools Radius corner hex design maximizes socket durability while limiting fastener wear over time All socket forged from high quality CR MO alloy steel 51 piece set offers durable