... 1>Bearing bar pitch:30,40,60mm 2>Cross bar pitch;50,100mm 3>Plain,Serrated,I- ... Hot-dipped galvanized, Steel Gratinga.full range in type & dimension b.largest production capability c.reliable manufacturer ... .8, 35.3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75 ... 4 Grating type: flat bar: plain type, plain I type, serrated type, serrated I type; cross bar: round type and square twisted type. 1 ...