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 and reliable use
• Radius corner design made to extend the life of fasteners
• Includes a heavy-duty molded case for added protection