The Norbar Torque Screwdriver is accurate, comfortable, durable and easy-to-use. Supplied with a 1/4in hexagon bit holder designed using a 4mm hexagon stem. The comfortable, durable handle is constructed using 2 materials; a base material for strength, overlaid with a soft feel grip for comfort and slip resistance. Allows for easy torque adjustment without the need of additional specialist tools and also has a lock to prevent accidental adjustment of the set torque. It comes supplied with a traceable calibration certificate (for the clockwise direction). Accuracy meets the minimal requirements of ISO 6789-1:2017.