... capacity, safe and skid-proof, easily fixed and dismantled, economical ,long life and durable, ventilated and penetration of ... appearance. 5) Application :Widely used in electricity, petrochemical and chemical industry, metallurgy, machines, modeling, port, marine ... stair step, trestle, fence wall and palisade, bilge limber board, well cover, suspended ceiling, ventilation and penetration of light, etc ...