Metal building materials, namely, metal reinforcement materials for building; steel rods; metal reinforcing materials for building, namely, tensioning and reinforcing elements of steel, tension bars and reinforcing bars, and structural steel mesh, and connecting elements therefor; nuts of metal, fastening nuts of metal, and metal fastening anchors in the nature of anchor plates for tension bars and reinforcing bars; steel sleeves; junction sleeves of metal, namely, metal fittings for rods and tubes in the nature of building materials; metal reinforcement materials for building, namely, wire rods; metal fastening anchors in the nature of mine and tunnel anchors; pre-stressed steel; bar steel in the nature of steel in bar form; flat steel in the nature of flat-bar steel