For use in multiplying the force of any drive wrench.
Any force applied at the input end is multiplied at the output end by the ratio listed for each model.
Mathematic formula: force x distance x multiplier factor = torque x multiplier factor.
(force = pounds applied by operator), (distance = lever arm of wrench handle in inches), (multiplier factor = ratio of output to input), (torque = actual force applied to wrench head).
Output will vary between 10 & 20% in each stage of multiplication due to frictional losses.