... -w-4, 19-w-2, 15-w-2 etc. 3Twisted Cross Bar Pitch38.1, 50, 60, 76, 80, 100, 101.6 ... steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth, Serrated /teeth, I bar ... ),UK: BS4592-1987, Australia: AS1657-1985, Japan:JIS galvanized iron floor grating,galvanized steel ladder.serrated bar grating,galv serrated grating,anti ...