The 7180 is adjustable and designed for installing wheel bearing cups of tractor/trailer wheels from 11 000 to 50 000 lb. capacity. 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. You would actually need about 30 plates to cover the range of this one tool. And it does the job without damage. Universal bearing cup installer. Adjusts from 3 5/8" to 6 1/2" dia. bearing cup O.D.