... -bearing capacity, can be used in wharf,airport etc.Application:urban road, public squares, gardens, wharf, airport, parking, highway, railway, industrial ... : G 325/30/100 WFG1.CERTIFICATE : ISO 9001:2008 quality system certificateINTRODUCTION TO COMMON STEEL GRATINGS:Bearing bar centers at 20mm ... , please contact us. galvanized steel trench cover for rain draining system