One of the great features of this air hydraulic axle jack is the choice of 3 handle angles, 90 degree - for space saving storage, 45 degree- for easy carrying movement and 0 degree - for access to lifting point. A heat treated extension screw allows low pick-up height adjustment and maximum lift height. The U.S. patented built-in bypass device protects hydraulic system from over pumping damage. The jack features hard rubber tires on steel wheels for easy positioning and smooth motion, sturdy 1-piece handle assembly, and a chrome plated ram. It uses standard shop air pressure required (110-175 pounds per square inch). The user-friendly, self-returning spring minimizes operator"s effort greatly, reducing fatigue. The inline air filter traps contaminants and protects air motor for longer life. 1 inch and 2-1/2 inch adapters are included.