8″ Caster Wheel Assembly for the Drive Medical Knee Walker 8″ (200 mm) Caster Wheel Assembly for the Drive Medical 790 Steerable Knee Walker Axel diameter is 10mm ID Width of the hub is about 1-1/2 inches Includes 6900Z Bearings Caster is used both on the front and on the rear Should replace 8″ casters with 3/8″ ID bearings and 1-1/2″ hub width
