Impact socket set made of the finest quality SAE 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. Most sets come with two-tone blow mould case with removable lid for use as an organizer. Meets or exceeds US Federal specs GGG-W-660A and ANSI specifications. Blow mould case. Includes 10, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22 and 24 mm standard length.