Purely Mechanical structure design, conventional to work with a forklift.Move one drum at one time by the forklifts movement without any other force.Handle more types of drums, including steel oil drums and PE oil drums.Enable loading and unloading drum inside the limited space such as a container. Massively improve on space utilization.Auto-lock is equipped for connecting forks to make sure the drums wont slip off when they are on gradient or bumpy road.