High efficiency planetary gear sets achieve high output torque from low input torque Most models operator protected by anti-backlash device Multiplier output accuracy ± 5% of input torque Reversible, tighten or loosen bolts Reaction bar or reaction plate type Angle-of-turn protractor standard on E300 series models E300 and E400 torque multiplier series replaceable shear drives provide overload protection of internal power train (one replacement shear drive is included)