... dimension b.largest production capability c.reliable manufacturer d.competitive price ZRHH GALVANIZED STEEL GRATING Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing StandardsChinaYB/T ... A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating6Grating StylePlain / Smooth, ...