Torque accuracy: ± 6%. To be used with bit inserts 861-862 or in conjunction with adaptor 892/3, with which they are all provided, or with 1/4″ square drive sockets. Models 584F and 586F are also supplied with 1/4″ drive sliding T-handles (art. 900/42), which fit in the top of the handle for increased leverage.Operating Instructions Set the required torque figure by pressing and turning the milled scale grip.