Building and construction materials and elements of metal, namely, metal reinforcement materials for building, steel rods, bar steel, and plated steels; building and construction materials and elements of metal, namely, steel connectors made of plated steels and steel bars for concrete embedded in precast reinforced concrete elements for use in bolted connections of precast reinforced concrete columns with foundations, columns, or precast reinforced concrete beams; pillars of metal for buildi...