Cementex 636TSD6-36 In-Lbs Torque ScrewdriverSize: 6 to 36 In-Lbs Square Drive Size: 1/4 in. Precision micrometer scale calibrated in Inch-Pounds, increments 1 in-lbs Easy-release bit holders featuring 1/4 in. Female hex drive securely retain bits during operation while permitting easy removal Anti-backlash design for repeatability Meets or exceeds ASME B107.14M and ISO 6789 specifications Adjustable model accuracy is +/-4 of setting, starting at 20% of full scale Clockwise (right-hand) only