... >Cross bar pitch;50,100mm 3>Plain,Serrated,I-shape 4>galvanized Standard Grating Features: High strength and light structure The reliable ... , 34.3, 35, 40,41,60mm. US standard: 1"x3/16", 1 1/4"x3/16", 1 1/2"x3/16", 1 ... "x 1/4", 1 1/4"x 1/4", 1 1/2 ... "x 1/4" etc.3Cross bar pitch40,45 ...