... T 4001.1-2007GB 700-88GB/T13912-2002AmericaANSI/NAAMM(MBG531-00)ASTM(A36)ASTM(A123)BritainBS4592-1995BS4360(43A )BS729AustraliaAS1657-1992AS3679AS1650 ... 23.85, 25, 30, 30.16, 30.3, 32.5, 34.3, 35, 38.1, 40, 41.25, 60, 80mm etcUS ... SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth, Serrated /teeth ...