Advantages:

 (1) It has light weight ,small volume and compact conformationk.

 (2) It can stand wear and teer as well as corrosion resistant.

 (3) It's difficult to skid ,it doesn't damage the surface of the goods,it suits the frequently loading.

 (4) It can greatly reduce the damage of the steel wine , increase the function  since adopting the reasonable gang system.

 (5) Convenient to operate with its small arbor force.