Suitable for rope diameter of 8-13mm / 0.3-0.5inch; and suitable for cableway, cave exploration, and Usage: You can put it on the rope at first, and then put it into clean water, pull the rope for cleaning The stainless steels has high strength, wear resistance and firmness Nylon brush has high mechanical strength, heat resistance and good lubrication Rope cord cleaning brush is lightweight and has a portable size, very easy to operate