... quality steel grating 3. Easy installation & saving work time. Advantages of steel grid plank: light weight, strong intensity, big load capacity, transmission and aeration ... , 120mm, 2'' & 4'' etc 4Material GradeASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray ...