6 METAL CONSTRUCTION MATERIALS, NAMELY, BEARING ELEMENTS IN THE NATURE OF ALUMINUM SUPPORTS FOR ROOF CLADDING [OF] * AND * ROOF RIDGES, PROFILES FOR SECURING ROOFS CLADDING * , * AND WIND SHIELDS ATTACHED TO ROOFS TO CREATE MAXIMUM AIR DRAW AND REPEL SNOW AND RAIN; ROOF BEAMS, RAFTERS, COLLAR BEAMS, PURLINS, POSTS, HORIZONTAL BEAMS, BRACES, SCREWS, BOLTS, LIGHT-ADMITTING ROOF-CLADDING PANELS, TRANSPORTABLE ROOF STRUCTURES MADE THEREFROM, AND PORTABLE METAL BUILDINGS