Heavy-duty Transmission Jack Adapter works with most service jacks and others having a removable saddle and 1 1/4in. hole. Specially designed for use with automotive or truck transmissions, differential gears and rear axle units. 1000-lb. capacity. double chain included. Converts Floor Jack into a Transmission Jack Adjustable to Fit Almost All Transmissions Fits all Floor Jacks with Removable Saddle Shaft Tilts Forward and Back Includes double Safety Chain