1. Multipurpose: lifting, supporting and hauling goods with hand-driver. 2. Safety and reliability: easy stop in any position with self-lock. 3. Lubrication: factory lubrication before packaging. 4. Optional drums: three options available: single drum, split drum or widened drum. Serial model. Suit with different rated load. 5. Super performance: cast worm with heat-treated gear makes the mechanism unique reliable and durable. 6. Smooth drive: oil-retaining bushings or bearing for smooth drive. 7. Durable surface finish: powder-coated surface plus zinc-plating for longer corrosion resistance. One in a carton, 108 cartons in a steel plate.