... grating 3. Easy installation & saving work ti 1.Comprehensive type and broadest range in dimension.1.1 Material Q235 , or other equivalent material1.2 ... .3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, 80, 100, 101.6, 102 ... ……The sizes and dimension is not limited to above.1.4 Grating type: flat bar: plain type, plain I type ...