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