... pitch;50,100mm 3>Plain,Serrated,I-shape 4>galvanized Standard Grating Features: High strength and light structure The reliable grid ... chemical plant, the refinery, the iron and steel plant, the paper mill, the machine factory, the cement plant, the municipal engineering ... , 30.16, 30.3, 34.3, 35, 40,41,60mm. US standard: 1"x3/16", 1 1/4"x3/16", 1 1 ...