OTC 7180 Universal Bearing Cup Installer Used to install cups ranging in size from 3-5/8 inch O.D. to 6-1/2 inch O.D Turn the expander to the left or right to adjust the installer jaw diameter to the approximate same size as the bearing cup inside diameter Finger tighten the nut to prevent the expander from moving once the jaw diameter has been set and install the bearing cup Weight is 11 lbs.