Service jack has a heavy-duty steel frame and casters to handle the largest loads. Air hydraulics makes raising and lowering loads smooth and easy. Air trigger and handle release for controlled descent. Lift Capacity (tons): 10, Min. Lift Height (in.): 6 5/16, Max. Lift Height (in.): 22 1/32, Operation: Air, Working Pressure (PSI): 101 - 145, Air Inlet Size (in.): 6/25, Safety Valve: Yes, Base L x W (in.): 64 5/8 x 18 29/32