... factory, transportation, municipal, administration, parking lot etc.3) steel grating may be applied to platform, floor, walkway, stair treads, trestle, fending, drainage ... ,30,35,40,50mmCross bar pitch38,50,80,100mmmaterialLow carbon steel, stainless steel, aluminiumSurface treatmentUntreated, hot galvanized, paintedStandardsChina: YB/T 4001.1-2007USA ...