... c.reliable manufacturer d.competitive price ZRHH GALVANIZED STEEL GRATING Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing StandardsChinaYB/T ... , 80mm etcUS standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w ... Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating6Grating StylePlain / ...