JET 1-inch Drive, 9-Piece Regular SAE Professional Impact Socket Set, 6 Point, 610501Blow mould case with removable lidSockets made of the finest quality S.A.E. 4140 Chrome Molybdenum high impact steelChamfered edges allow easiest socket placement on fastener, increasing productivity and reducing frustrationTORQUE DRIVE socket design contacts the fastener on the sides instead of the corners, reducing fastener rounding and allowing up to 20-Percent more torqueMeets or exceeds U.S. Federal Specs: GGG-W-660A and ANSI specifications