The DELTA 50-289 mobile machine base for unison lets you easily and safely move your machines out of the way when not in use, so you’ll be able to maximize the space in your shop. The 50-289 fits all DELTA unisons with 52 In. UNIFENCE and adds rolling portability. The mobile machine base features a foot-operated control lever that lets you easily raise and lower the base for either moving or locking it in place. When lowered into position, the base has adjustable foot pads to ensure even contact with the floor. It is made of durable steel.