Precision torque screwdriver with clutch release to prevent over-tightening. Indispensable for repairing mobile phones. The sturdy metal housing and sophisticated mechanism allow for trouble-free continuous use. - Suitable for bits with 1/4'' external hex drive C 6.3 and E6.3 - Ratsches when the set value is reached - No over-tightening of the screw - Provides a signal (audible and tactile) - Adjustment via micrometer scale - Left- and right-hand tightening - Additional units: oz-in, lb-in, kgf-cm - 1 torque screwdriver without bit