... bolts or welding, with nosing or not stair tread , steel stair tread , metal stair tread with fixing by steel bolts or welding ... and steel structures, stair tread, well cover, trench cover, compound gratings, storage shelves, ladder, fences and handrail so on for construction ... Grating. They are widely used in steel structure platforms, stair treads, sidewalks, drainages and well covers etc. We can ...