The Drive Universal Cup Holder features a clamp that swivels, allowing you to always keep contents level. This mobility accessory easily attaches to wheelchairs, rollators or walkers with tubing diameter from 5/8 inch to 1 inch, and if necessary, a special clamp insert can be added or removed to accommodate different size tubing. This mobility cup holder is made of durable lightweight plastic. Dimensions: 3 inches Long x 3 inches Wide. Limited 1 Year Warranty.