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 Wire o notebook restricting, also known as twin loop wire, wire-o, double loop wire, double-o, ring wire, and a wire tie, is a popular commercial bookbinding method. Clients use this limiting method by embedding their punched pages onto a "C" molded spine and then crushing the spine with a wire closer until it is round. Documents bound with wire or notebook binding open completely level on a work surface and allow for 360-degree rotation of bound pages. There are three common hole designs used in document restriction with double loop wire o notebook. Each hole design specifies the sizes and applications for which it is best suited. Here's a quick rundown of the various options. The three to one pitch hole design is most commonly used to limit small measured documents with double loop wire . Spines for this limiting style are available in widths ranging from 4.8 mm to 14 mm. Wires with a three-to-one contribution ratio are not available in sizes larger than 14 mm. The hol...