... .reliable manufacturer (a state-owned company) d.best price1.Comprehensive type and broadest range in dimension.1.1 Material Q235 , or other equivalent ... , 35.3, 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 ...