6 Metal materials for building or construction, namely, ducting and fittings being elbows, tees, couplers, reducers, flanges, end caps, sleeves, wall plates, brackets, joints, risers, support struts, attachment plates, stands, and metal fittings for use with pipes to prevent a duct cover from being separated; metal covers for piping of air-conditioning apparatus or electric space cooling apparatus; metal covers for water supply pipes of metal; metal covers for drain pipes of metal; metal covers for non-metallic water supply pipes; metal covers for non-metallic drain pipes; metal fittings, namely, duct fittings being elbows, tees, couplers, reducers, flanges, end caps, sleeves, wall plates, brackets, joints, risers, support struts, attachment plates, stands, and metal fittings for use with pipes to prevent a duct cover from being separated; metal brackets, namely, metal mounting brackets for general use and use with ducting; metal saddles being metal brackets for securing pipes and ducting