... ISO9001 Company, MS.Spring +8613512873247Hot dip galvanized steel grating, bar grating, stair treads, trench cover , tank grating , pavement grating , ... Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth, Serrated / ... ,Germany: DIN24537-1-2006, Japan:JIS galvanized steel grating, bar grating, stair treads, trench cover-1