... high technology rich experience quick shipment well cover grating(trench cover grating,drain cover grating) Packaging Detail:seaworthy ... , platform and steel structures, stair tread, well cover, trench cover, compound gratings, storage shelves, ladder, fences and ... corridor, storage shelf,Attic panel, trestle, guardrail, sunshade gate, etc. Standard: British, German,French and Japanese standards ...