"This Ame International Aluminum Jack is super heavyweight and super easy to handle. Includes auto shutoff valve that allows pump to be removed while ram is extended. Safety Valve Yes, Max. Lift Height in. 17 3/4, Lift Capacity tons 100, Min. Lift Height in. 11 3/4. 6in. stroke 11 3/4in. to 17 3/4in. lift range"