Steel towline of the main chain plate (high quality steel chrome-plated) support plate (aluminum) squeeze pull of shaft pins (alloy steel) and other components, so that does not produce the relative motion between the cable or rubber tube with towline not produce distortion, chain plates, chrome plated novel effect of shape, reasonable structure, nimble, high strength, steel is good, no deformation, easy installation, the use of reliable, easy disassembly, in particular, this product uses high-strength wear-resistant materials, alloy yellow steel axis pin, improve the abrasion resistance of the product more flexible, bending, resistance is smaller, lower noise, which can guarantee long-term use is not deformed, does not sag.