Heavy-duty industrial and farm use jack is for repairs of equipment, trucks, trailers and farm equipment. Lift Capacity (tons): 20 / 40, Min. Lift Height (in.): 5 5/16, Max. Lift Height (in.): 14, Operation: Air, Working Pressure (PSI): 110, Air Inlet Size (in.): 6/25, Safety Valve: Yes, Base L x W (in.): 20 x 1 1/10