... grate 1,stainless 2,strong strength 3,durable products 4,water leakage area 83.3% Steel Grating1) Material: Mild Steel (Low ... ) Shape of bearing bars: Plain style , Serrated style , I section style4) Main usage: stair trends, trench covers, drainage pit covers production standardChinaYB ... ,pls do not hesitate to contact us: specializing in the production of steel grate