This heavy-duty base can carry up to 500 lb (226kg). Assembled much like a Meccano® set, it adjusts from 12" to 52" in 1" increments, forming a maximum 36"x36" square or 20"x52" rectangle. Made from 0.08" thick steel with a powder-coat finish, it weighs 15-1/2 lb. It has two 3" swivelling casters and two 3" fixed wheels. Leveller feet stabilize the base when wheels are raised. To move the base, easy-to-operate glass-filled nylon cam locks on the swivelling casters lower the wheels.