... AS1657, JS3101Grating Steel Material:Low Carbon Steel, Mild Steel, Grating Size:3'x20', 3'x24', 3'x30', 1000x1000, 1000x5800 ... Material StandardASTM A36, A1011, A569, Q235Grating ProductsSteel Grating, plain and serrated grating, trench grate, stair treadGrating Surface:Hot dip ... Application:steel platform, flooring and walkway, trench cover, stair tread contact personMichelle Gao 25mm steel grating