The Drive Medical Universal Walker Wheels with Rear Glides comes with caster wheels and two sets of rear glides. The rubber wheels allow most walkers to roll easily and smoothly over irregular surfaces, and the rear glide caps with covers allow for use on all surface. Features Allows for 8 height adjustments Converts folding walker into wheeled walker Includes rear glide caps, (item #10107) and glide covers (item #10107C) allowing use on all surfaces Rubber wheel allows walker to roll easily and smoothly over irregular surfaces