These mobility glides are designed for use on two-wheeled walkers to travel over carpets, hard floor coverings, sidewalks, pavement, lawns and rough surfaces. These mobility guides increase mobility; reduces drag and friction; fits on back legs of wheeled walker. These mobility aids fit over 1-1/8 in. diameter leg, and is made of durable nylon. Attaching hardware included (screwdriver required). Recommended by Occupational and Physical Therapists. Comes in a pair.