1.ISO9001:2008 quality systems 2.4 running lines. 3. Delivery: ... loading-bearing capacity.TypeW-- welded steel grating L-- pressure-locked C-- socket-weldingBearing bar centers15-30, 40, 60, 80, 90 mm etc ... it's light weight.Notes: common welding standard: single-side full welding every 3 bearing bars. Socket-welding steel grating,steel bar grating,welding bar grating