Drag cable chain, also known as wire and cable protection drag chain (Cable carrier), is a device that binds cables or wires or air pressure pipes and oil pressure pipes to facilitate their rotation and movement，Drag chains are divided into steel drag chains and plastic drag chains. The steel towline is composed of steel and aluminum and can be customized. The plastic towline is also called engineering plastic towline and tank chain. The towline can be divided into three types: bridge towline, fully enclosed towline, and semi-enclosed towline according to the use environment and requirements.