... 12.5, 15 to 30, 40, 60, 80 and 90mm; of which 30 and 40mm are recommended 2) Cross bar pitch may ... be 30, 38, 50, 76 and 100mm; of which 50 and 100mm are recommended 3) Advantages of steel grid ... intensity, big load capacity, transmission and aeration, anti-skid and secure, wears well, non-sagging, non-dirt, and easy to install 4) Hot galvanizing ...