ATD ATD-7431 1/2 Ton Air Actuated Telescopic Transmission Jack It has a capacity of 1/2 ton The minimum height is 37-7/8 inch and maximum height is 77-5/8 inch Saddle base dimensions are 8-7/8 inch x 12-7/8 inch and an expandable area of 11-1/2 inch to 21 inch Requires 110-175 pounds per square inch Meets ASME/ANSI-PALD safety standards