With these motorized trolleys, the winches can move up and down, left and right (4 directions) along the girder. These winches can be supplied up to 20 tons capacity with the right crane span. hoists are used in single girder and monorail cranes. Normal quadruple hoist are suitable for work that is not highly sensitive. The benefits of a normal four-door lift can be the price, ease of maintenance, high safety and more.