... three kinds of steel gratings, they are Plain Style Steel Grating, Serrated Style Steel Grating and I Bar Type Steel Grating. They ... Cross Bar Pitch38.1, 50, 60, 76, 80, 100, 101.6, 120mm, 2'' & 4'' etc 4Material GradeASTM A36, A1011, A569, Q235 ...