If you choose a gourd manufacturer, you choose a product of poor quality, which is easily corroded when used. Usually do not pay attention to maintaining the raising chain. In a humid environment, the phenomenon of corrosion will occur over a long time. Working in an environment with corrosive objects, the surface of the 80 -level lifting chain is corroded. After using the manganese steel chain, it is not applied to rust -proof oil in time, which is prone to corrosion. Usually use heavy chains to do a good job of maintenance and extend the service life.