These are not photocopies, but reproductions of the originals. These posters have been professionally digitally edited, retaining some of the slight imperfections of the original Atlas Press Co. Publications from the 1940’s. Professionally printed on 36 lb high resolution coated bond matte poster paper, which is comparable to the originals. Includes the following four poster charts. Thread Forms and Formulas. 60 Degree V Type Thread Dimensions. Charts each measure 16 5/16 x 21 5/16. Excellent addition to your shop.