Seat Storage Shelf 3 in. Casters. Our rolling garage stool is sturdy and reliable. 300 LBS high capacity and 15 in. seat allow you to work in your garage or workshop in comfort. The pneumatic seat can adjust the ideal height from 24 in. to 28.7 in. for projects. A large storage tray allows your equipment in order. Large casters provide excellent mobility and the two brakes keep the seat in place during work.