1/2" Drive 40-250 lb.ft. Click Torque Wrench. Features and Benefits: All steel construction and American craftsmanship. Patented Roller Release Mechanism increases reliability and accuracy by eliminating virtually all friction. Accuracy: 3% of reading Clockwise and Counterclockwise. Engineered, machined, chromed and assembled in the U.S.A. Delivered in custom case made in the U.S.A. Engineered, precision bearing surfaces extend the calibrated life of the M series line to many times the life of competitor's tools. Calibration can be performed by a qualified laboratory, calibration is done completely externally unlike traditional micrometer click wrenches which require disassembly.