The Steelman 50079-1 torque stick is designed to prevent damage to wheels, studs, and brake rotors by reducing the risk of over-tightening lugnuts. It attaches to your 1/2-Inch pneumatic or electric-powered impact wrench and has a 21mm hex-shaped socket on the other end for your lugnuts. It has been designed to limit the effective output of your tool to 150 foot-pounds, preventing bolt stretching and premature failure. The torque stick has a powder-coated turquoise finish, that will help you find it in your crowded toolbox. Always complete lugnut tightening with a calibrated torque wrench, like the Steelman 96218 1/2-Inch Drive Adjustable Torque Wrench. Key Features: 1/2-Inch Drive Torque Stick, 21mm - 150 foot-pounds (203 Newton-meters) (Turquoise) (BB), Designed to prevent damage to your wheels, wheel studs, and brake rotors, Properly torque the lug nuts to your vehicle's specifications, Color-coded, so each color represents a specific torque rating and lug nut size