All components forged from high quality chrome vanadium steel. TORQUE DRIVE® sockets contact the fastener on the sides rather than the corners, reducing corner rounding and allowing 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 US Federal specs GGG-W-641E and Canadian Government specs CDA39-GP-12b and ANSI specifications. Not to use with chrome sockets on impact wrenches. Standard accessories 48 tooth 8 inch quick release oval head ratchet. 3 inch and 6 inch extensions. 8 inch flex handle. 1-7/8 inch universal joint. Blow mould case with removable lid. Set includes 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 inch.