Design and manufacturing as steel grating . Appearance of modern, simple and beautiful, high fracture strength. Cut rate of *0 percent, cement and cast iron covers are cut several times, good drainage, so that the grass at the end of the tree can be fully exposed to air and sunlight. Hot-dip zinc surface can be a permanent anti-corrosion. Designed to facilitate the erection and removal have device. Widely used for municipal roads, gardens, squares, and other commercial and residential community