The well cover is also called "ditch cover", "manhole cover", "ditch cover", "the manhole cover was originally made of cement, and it is easily damaged in the normal use of the middle ditch. Later...
Hot Dip Galvanized Steel grating has powerful functions and is widely used in platforms, walkways, trestles, trench covers, well covers, ladders, fences, guardrails and other fields in petrochemic...