Everything related to the commercialization, import and export of steel and iron materials used in construction: such as beams, slabs, structural lines, double "T" beams, plates; structural houses: asphalting of roads, urban planning; extraction, processing and marketing of granular material, yellow earth; as well as the manufacture, marketing and transportation of gray cement, white cement, gray glue, white glue and white plaster; hiring professional and trained personnel in related activities.