These Wire-O binding wire, also called "double-wire" or "twin-loop binding wire," is a versatile binding spine, with 3:1 pitch and 32-loop are available in a wide range of sizes that offers security and durability, but with style and affordability. The wire binding spines are 11 inches in length and are designed to be used with Letter size documents. However, they can also easily be cut with wire cutters to accommodate books with spines smaller than 11 inches long and can then used with a 3:1 pitch wire binding machine perfect for binding reports, presentations and any other book binding projects.