... ,60mm 2>Cross bar pitch;50,100mm 3>Plain,Serrated,I-shape 4>Hot-dipped galvanized,Painted,Untrea 1.Metal ... 25X5…..40X6, 40X8, 40X10,….90X6….Pitch of Load bearding flat bars(mm)12.5,15, 20, 30, 30.6, 32 ... 34.8, 35.3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, 80, ... 4 Grating type: flat bar: plain type, plain I type, serrated type, serrated I type; cross bar: round type and square twisted ...