Our MaxWorks Adjustable Roller Seat/Creeper features a pneumatic cylinder that allows you to choose your desired and comfortable working height with simple side lever adjustment. Includes five 2-1/2" diameter non-marring swivel castors that roll easily under load. Thick and comfortable seat cushion with built-in 15-1/4" diameter tool tray adds versatility. The seat has a height range of 15" to 20" and rated up to 300 lb. maximum capacity. This chair is a must for your garage whether you are waxing your wheels or detailing your car or filing paper work in your office.