... .Comprehensive type and broadest range in dimension.1.1 Material Q235 , or other equivalent material1.2 Grating Conformity Standard: YB ... 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, 80, 100, ... The sizes and dimension is not limited to above.1.4 Grating type: flat bar: plain type, ... type; cross bar: round type and square twisted type.1.5 Finishing treatment: a. Galvanized, b. Untreated ...