... 40x5, 50x5, 65x5, 75x6, 75x10---100x10mm etc; I bar: 25x5x3, 30x5x3, 32x5x3, 40x5x3 etcUS standard: 1'' ... steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth ... , Serrated /teeth, I bar, serrated I bar 7StandardChina: YB/T 4001.1-2007, USA: ... reputation of our products: hot sale!!!bar grating