Common metals and their alloys; building materials of metal, namely, Metal gratings, press locked gratings, ultra-gratings, heavy duty gratings, louvre gratings, full gratings, press welded gratings, anti-skid gratings, stairtreads gratings, shelf gratings, comb gratings, offshore gratings, press welded gratings with perforated sheets, barefoot gratings, tree gratings, finned gratings, fence gratings, walkway gratings, escape stairs, hand rails, staircases, stair treads of metal; transportabl...