Original concrete trade vintage catalog for W-O-I PRODUCTS COMPANY. Main office was located at 3345 North Lincoln Street, Chicago, IL. Manufacturers of concrete nails, buck anchors, form spacers and building specialties. Illustrated is the manner in which anchor spreads when driven through wood screed into gypsum block. This unique 1931old one page building construction materials brochure would display beautifully matted and framed. A marvelous addition to your retro architectural design and engineering library.