Features and Benefits: Works on axles from 11,000 to 50,000 lb. capacity; Adjust to fit 3-5/8 in. to 6-1/2 in. O.D. bearing cups, which adds up to as many as 30 individual drivers; Helps eliminate the damage caused by makeshift methods; This handy, adjustable tool is designed to install wheel-bearing cups in a wide range of heavy-duty axles. ; Simply adjust and lock the jaws to the cup I.D., slip on the new cup, set it in the bore, and drive it in with a hammer. ; Features:Adjusts from 3 5/8 in. to 6 1/2 in. diameter Bearing cup outer diameter Adds up to as many as 30 individual drivers Installing wheel bearing cups of tractor/trailer wheels from 11,000 to 50,000 lb. capacity.