Beams of common metal for scaffolding; beams of common metal for formwork systems; beams of common metal for building; joists of iron or steel; prefabricated aluminum scaffolding frames; props of metal, namely, post-shores, shores, posts, supports, legs; metal building materials namely, post-shores, shores, posts, supports, legs; extruded aluminum sections in the nature of post-shores, shores, posts, supports, legs; shuttering of metal for concrete; building and construction materials, mainly consisting of metal, namely, beams, formwork beams, secondary beams