The Special Tomato Mobile Activity Tray provides adjustability, maneuverability and versatility for many situations. The Mobile Activity Tray is available in two sizes: Short (table height adjusts from 16 to 21 inches) and Tall (table height adjusts from 20 to 28 inches). The tool-free adjustable height range allows for growth as your child grows into new equipment. It also allows the Mobile Activity Tray to be used with different pieces of equipment: Special Tomato Soft-Touch Sitters, wheelchairs and walkers to name a few. With a base width opening of 28 inches, the Mobile Activity Tray can accommodate most pieces of equipment. The Mobile Activity Tray surface has angle adjustability that is also tool-free. The tray surface can be infinitely placed anywhere between 0 and 80 degrees. Keep the Mobile Activity Tray flat for mealtime, tilt it slightly to work on fine motor tasks like writing or tablet work, or tilt it more for working on visual tracking or reading. The Mobile Activity Tray is easy to move around a room and from room to room. The 3-inch front swivel casters making turning easy and have locks to keep the Mobile Activity Tray in place. The 4-inch rear casters are inline to keep the tray stable once the front swivel casters are locked.