Wire binding is a popular commercial book binding method, and is known by a number of different names including twin loop wire, wire-o, double loop wire, double-o, ring wire and wirebind. With this binding method, users insert their punched pages onto a “C” shaped spine and then use a wire closer to squeeze the spine until it is round. Documents that are bound with wire binding will open completely flat on a desk and allow for 360 degree rotation of bound pages.

To bind documents with double loop wire a binding machine and a wire closer are required. Smaller organizations will often choose a small manual wire binding machine that offers a manual hole punch and a built in wire closer. Medium-sized users will often choose a wire binding machine with an electric punch and built in wire closer. Heavy users generally prefer machines with automated punching and interchangeable dies so as to accommodate documents of various pitches by merely changing the dies