"This Sunex Air/Hydraulic Jack is designed to handle heavy-duty truck and trailer applications plus is portable for roadside service calls. ASME PALD 2009 Certified. Max. Lift Height in. 21 1/8, Operation Air/hydraulic, Safety Valve Yes, Base L x W in. 23 1/4 x 13 1/4, Min. Lift Height in. 8 13/32, Working Pressure PSI 100, Lift Capacity tons 22. Narrow chassis design fits easily between tandem wheels 8in. pneumatic wheels provide maneuverability and lift off the ground when under load to prevent damage T-handle features lever for locking into one of three positions and has independent release knob Overload and bypass safety valves Telescoping ram and integrated filter to protect air motor Includes 1.75in. diameter saddle with 1.87in. and 2.62in. diameter saddle adapters and 2in. and 4in. extension adaptors with handle mounted saddle holder Includes FREE 1in. Drive Impact Wrench with Extended Anvil"