... flat steel bar in accordance with a certain spacing and cross-arranged and welded into the middle of a square lattice ... proof, anti-skid performance is good; no plot dirt, rain and snow is not the plot, not water, self-cleaning, easy ... Material StandardASTM A36, A1011, A569, Q235Grating ProductsSteel Grating, plain and serrated grating, trench grate, stair treadGrating Surface:Hot dip Galvanized ...