Stanley Proto J6106ACERT 1/4-Inch Drive Torque Screwdriver, 4-Percent, 7-36-Inch Pound - CERT Calibrated to 4% of torque reading, clockwise at 20% to 100% of full scale 1/4-inch Square to 1/4-inch Hex Adapter included for use with insert bits Industrial heavy duty design Aircraft grade aluminum Aircraft quality spring