... , A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted, spray coating6Grating StylePlain / Smooth, Serrated ... (MBG531-88),UK: BS4592-1987, Australia: AS1657-1992, Japan:JIS Galvanized and Painted Steel Grating with standard size