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 72 tooth high torque ratchet (670927). 2 inch (670904) and 4 inch (670915) extensions. 6 inch spinner handle (670912). 1-3/8 inch universal joint (670908). Blow mould case with removable lid.