9,000 Pound Rolling Jack With (2) Internal Air Bags, Adjustable outriggers that Roll on the inside of the rail. Will easily slide onto a rack with rails that measure from 38.685" to 52.1875" center to center . Includes Detachable Mounting Pads with 3" and 6" Extensions. Lifting stroke of 11 inches. Est. Shipping Weight 480 lbs.