1.ISO9001:2008 quality systems. 2. 4 running lines 3.Full range of steel gratings Wanjie brand heavy-load steel gratings ... and trains, and ditch covers for heavy truck access. Features of steel gratings:Light weight, heavy-duty, large loading-bearing capacity, economical, ... Austrilia: AS1657-1992Marks:Example: G 325/30/100 WFG Heavy load steel grating,heavy duty steel grate,industrial heavy duty grid