... or hot dipped3.Characteristic:steel grating (1)high strength, (2)light structure, (3)good appearance(4)durable in use ... , 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc.3Twisted Cross Bar Pitch38.1, 50, 60, ... 76, 80, 100, 101.6, 120mm, 2'' & 4'' etc4Material GradeASTM A36, A1011, A569, Q235, S275JR, SS304 ... NAAMM(MBG531-88),UK: BS4592-1987, Australia: AS1657-1992, Japan:JIS 32x5 serrated steel bar grating