... pitch:30,40,60mm 2>Cross bar pitch;50,100mm 3>Plain,Serrated,I-shape 4>galvanized Standard Grating Features: High ... , good natural lighting, good heat radiation property, explosion-proof, good anti-skid property Contamination proof Uses: Widely applied in the power plant, the ... , 15, 20, 23.85, 25, 30, 30.16, 30.3, 34.3, 35, 40,41,60mm. US standard: 1"x3/16", 1 ...