steel grate 1,stainless 2,strong strength 3,durable products 4,water leakage area 83.3% Steel Grating1) Material: Mild Steel (Low Carbon Steel) or Stainless Steel.2) Surface Treatment: Hot dip galvanized , Painted , Untreated.3) Shape of bearing bars: Plain style , Serrated style , I section style4) Main usage: stair trends, trench covers, drainage pit covers production standardChinaYB/T4001.1- ...