... 50,100mm 3>Plain,Serrated,I-shape 4>galvanized Standard Grating Features: High strength and light structure The reliable grid ... ventilation, good natural lighting, good heat radiation property, explosion-proof, good anti-skid property Contamination proof Uses: Widely applied in the ... , the well lid, the ladder, the railing, the guard rail and so on. NoItemDescription1Bearing bar25x3,25x4,30x3,30x4,30x5 ...