Design: The welded tank and frame provides superior strength; Likewise, the thick base design gives the most stable lifting platform for stronger performance, even in rough surface conditions. Motor: Specially engineered air motor for consistent and reliable operation where dual return springs help provide controlled and easy descent. Height: With a high height of 12.76" and a low height of 7.01", the super durable, 20 ton, bottle jack has shielded release screws that prevent accidental lowering and eventual injury to the user. Capacity: Operates at 110-120 PSI and are factory pretested to 150% of its rated capacity to ensure long shop life and consistent operation.