AFF Air/Hydraulic Bottle Jacks are used to lift heavy-duty trucks, construction, and heavy farm equipment. Both have centered pumps and rams with heat-treated pistons for balance and easy positioning. Saddles are made of machine hardened steel. Each operates at 90-180 PSI and is factory pretested to 150% of its rated capacity. They also include a safety bypass system to prevent possible damage from ram over-extension.