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 (671928). 3 inch (671905) and 6 inch (671907) extensions. 8 inch flex handle (671902). 1-7/8 inch universal joint (671910). Blow mould case with removable lid.