... are a leading professional designer and maker of Round grating , well grating , grating cover , round grid with high quality.We ... in Ningbonear to Shanghaiof China. Ningbo Lihong Steel Grating Co.,Ltd has approved ISO9001-2000 Quanlity Management System in 2003. ... in steel structure platforms, stair treads, sidewalks, drainages and well covers etc. We can design and manufacture standard steel grating ...