… of iron or steel; plates, rods, angles, shapes, sections, tubes and the like, prepared for use in structures, of iron …
Explanatory notes
… of iron or steel; plates, rods, angles, shapes, sections, tubes and the like, prepared for use in structures, of iron … metal structural elements of round cross‑section (tubular or other). These devices usually have protuberances with tapped holes in which screws are …