Karman Universal Wheelchair Cup-Holder is simple, and easy to install. Mounts to any 7/8′′ or 1′′ tubular frame on most wheelchairs, walkers, rollators, or transport wheelchairs. Universal Mount is compatible with most Wheelchairs and Walkers Fits tubing diameter 7/8′′ – 2.75′′ Adjustable Mouth for varying size beverages.