Heavy-duty lifting and positioning. Lifts up to 5 tons of weight, available for wide-range of lifting applications. Tri-adjustable height, span, and tread for maximum flexibility and adaptability. Easy to assemble and disassemble design for quick and convenient setup. Easy adjusting. Has 5-ton Harrison hoist. Has from 10ft to 18ft adjustment in height. 8"-high capacity casters. Complete self-contained unit.