... , transportation, municipal, administration, parking lot etc.3) steel grating may be applied to platform, floor, walkway, stair ... through facility, etc.4) category: 1.plain steel flat grates,2.I shape steel flat grates, 3. serrated steel flat ... 35,40,50mmCross bar pitch38,50,80,100mmmaterialLow carbon steel, stainless steel, aluminumSurface treatmentUntreated, hot galvanized, paintedStandardsChina: YB/ ...