Torque screwdriver suitable for electronic industry, precision mechanics and industrial manufacturing, serial manufacture with constant tightening value. Pre-set torque screwdriver without a scale. With 1/4 inch female hexagon drive for use with 1/4 inch hexagon bits as per DIN 3126-C 6.3. With adaptor also suitable for 1/4 inch square drive sockets as per DIN 3124. Working accuracy +/- 6 % tolerance of the set torque. Precision radial ball clutch and cam design for controlled bi-directional tightening. Precision mechanism slips very noticeably through when set torque is reached. Automatic resetting to the starting position. Lightweight construction by virtue of anodised aluminium handgrip. The pre-setting can be made at the factory or by the user on suitable torque testers.