... to ensure the shape unchanged after the galvanization.TypeW-- welded steel grating L-- pressure-locked C-- socket-weldingBearing bar centers15-30, ... 40, 60, 80, 90 mm etc. with 30, 40 mm recommended. ... treatment. 4. If any enquiries, please contact us. compound steel grating,steel grating with checkered plate,galvanized steel grating