... ;50,100mm 3.Plain,Serrated,I-shape 4.Hot-dipped galvanized,Painted, Hot dipped galvanized steel grating 1.Steel Grating is made ... -2 etc.3Twisted Cross Bar Pitch38.1, 50, 60, 76, 80, 100, 101.6, 120mm, 2'' & 4'' etc4Material GradeASTM A36, A1011 ...