Features: 1. Fitment: The 7180 is adjustable and designed for installing wheel bearing cups of tractor/trailer wheels from 11,000 to 50,000 lb. capacity. 2. Instruction: All you do is adjust and lock the jaws to the cup I.D., slip on the new cup, put it all in place, and hit the handle with a hammer. 3. Function: This handy, adjustable tool is designed to install wheel-bearing cups in a wide range of heavy-duty axles. .