CNC drag chain is a cable protection device on the CNC router, which is divided into open and closed. The material of the CNC cable chain is usually made of plastic and nylon. Comparing to plastic drag chains, the ones made by nylon are normally tougher and more resistant to dragging and are not easy to collapse. The cable chain is 1 meter/pcs, and the length can be freely spliced. When purchasing, the model refers to the inner height and inner width of the cable chain.