This International Standard lays down a method of attaching an offset plate to a duplicating machine by specifying for the plate the diameter and spacing of the holes, and the tolerances on their position. Offset plates, for example straight edge, attached by different means are not covered by this International Standard. By specifying the set of holes necessary to attach offset plates to the duplicator, both single edge — known as “trailing edge plates" — and double edge punched plates are brought within the scope of this International Standard. The dimensions given apply to offset plates made of any material, for example metal, paper, plastics. The overall dimensions, and therefore the number of holes in offset plates, have not been specified since these depend not only on the size of machine but on such factors as the number of copies to be run from a plate and the definition of the image required.