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