The fixing cap is divided into 9 × 9.5 and 7 × 7 models. It is made of pure PE material and contains anti-aging additives. It is more UV resistant and anti-aging. It is mainly used for fixing and fastening the steel wire on the top of the cement column of the protection system. One set can be installed on the top of each cement column. The steel wire can be tensioned longitudinally and transversely to make the whole protection system as a whole, and has stronger resistance to disasters and lodging; At the same time, fixed protective nets (including internal structural components of the top cap) can also be installed for safer protection.