Wire-O - twin loop, bindingA Wire-O (twin loop) binding holds the covers and pages of a document firmly in place by a double-loop wire inserted through the holes drilled in the edge of the document. All of the document's pages lay flat when opened and can turn easily through 360°.

Wire-O bindings come in a variety of colors and loop diameters from 3/16" to 1-1/4". They can handle documents from 1/8" to 1" thick. Often, they are used to bind reference books, reports, proposals, and calendars. They are durable, but do not permit printing on the document spine or the insertion of new pages.

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