Carefully selected assortment of impact sockets needed for most industrial applications and includes a convenient blow mould case with removable lid for easy storage and organization. Sockets made of the finest quality S.A.E. 4140 Chrome Molybdenum high impact steel. TORQUE DRIVE socket design contacts the fastener on the sides instead of the corners, reducing fastener rounding and allowing up to 20% more torque. Chamfered edges allow easiest socket placement on fastener, increasing productivity and reducing frustration. Extra long deep sockets ensure maximum accessibility. Meets or exceeds U.S. Federal Specs: GGG-W-660A and ANSI specifications