... , platform and steel structures, stair tread, well cover, trench cover, compound gratings, storage shelves, ladder, fences and handrail so on for ... construction project, oil project, seaport, power plant, water plant, defense project, chemical factory and so on.We produce ... -88)C) UK: BS4592-1987D) Australia: AS1657-1985E) Japan: JJS. water drainage metal slot drain cover