... steel gratings Trench coversUnique features:1.Attractive appearance : clear and smooth figure, silvery appearance, modern-styled. 2.Optimal drainage ... iron. 5.Heavy-duty and large loading-bearing capacity, can be used in wharf,airport etc.Application:urban road, ... public squares, gardens, wharf, airport, parking, highway, railway, industrial engineering and so on.Type of bearing barW--welded ...