Factory Pre-Set models are set at the factory to the customer’s specified torque setting, and are furnished with a Certificate of Calibration. Please specify desired torque setting when order is placed. Featuring a durable, non-slip cushion grip. Uses universal round shank interchangeable heads. Audible click and feel impulse torque control mechanism. Tamper proof torque setting for production line use. Accuracy: ? 6% of indicated value, CW, from 2% to 1% of full scale