The DELTA 50-273 Mobile Machine Base for Unisaw and Heavy Duty Shaper lets you easily and safely move your DELTA Unisaw or Heavy Duty Shaper out of the way when not in use, so you"ll be able to maximize the space in your shop. The mobile machine base features a foot-operated control lever that lets you easily raise and lower the base for either moving it or locking it in place. When lowered into position, the base has adjustable foot pads to ensure even contact with the floor. The DELTA 45-273 Mobile Machine Base is made of durable steel.