Attaches easily to 7/8” - 1” tubing; perfect for wheelchairs, walkers, rollators, scooters, chairs and more Holds cups, cans, mugs, and bottles; cutouts on each side of the cup holder accommodate cups or mugs with handles Cup holder measures 3.5” high; inner diameter measures 2.75” Constructed with lightweight plastic that is durable enough to withstand everyday use The clamp can be easily adjusted to a variety of angles to keep the holder level