... ,XYQ6B,XYQ3C 3.Adopt the gear transmission structure 1.The backup jaw plate frame is one component of the hydraulic tongs ... jaw plate frames: the lord jaw plate frame and the backup jaw plate frame.2.We can provide 3 types,XYQ12A ... ,XYQ6B,XYQ3C.3.The backup jaw plate frame adopts the gear transmission structure.