Low input torque is required and can easily be applied by one person;Internal planetary gear system provides strength and durability;Place an impact socket on the output square to attach to the fastener, then restrain the reaction bar against the equipment being serviced;Input and output rotate in a matching direction, while the reaction arm moves in the opposite direction from the input/output force;Torque accuracy of +/- 5% CW between 20% and 100% of wrench capability