... , being economical of materials, being sturdy and durable, ventilation, easy to clean and attractive appearance.2) steel grating are widely used by various ... ,25,30,35,40,50mmCross bar pitch38,50,80,100mmmaterialLow carbon steel, stainless steel, aluminiumSurface treatmentUntreated, hot galvanized, paintedStandardsChina: YB/T 4001.1-2007USA ...