19 Prefabricated Stairways; Components and Accessories for Stairways-Namely, Rail Units, Starting Steps, Treads, Risers, Shoe Rails, Hand Rails, Wall Rails, Pipe Rails, Stair Rail Fittings, Goosenecks, Balusters, Newels, Divider Posts, Landings, Return Nosings, Moulding, Shoes, Brackets and Rosettes; and Door Sills and Thresholds