Micrometer adjustment on all models allows easy, accurate setting. Accuracy in accordance with the requirements of ISO 6789:1992. Particularly suitable for use in electrical, electronics and instrument assembly work. With ¼in female hexagon socket for use with screwdriver bits and blades. Adjustment ring automatically disengages when tool is in use, preventing accidental adjustment. Smooth 'slipping' action completely eliminates over-tightening. Bi-directional operation with consistent repeat accuracy. Precision radial ball clutch and cam design gives automatic resetting. Removable tommy bar (except Minor models) provides extra grip where required. Fully ESD compliant.