Wire-O (or spiral) binding is a method for binding loose leaves using a series of metal wire loops formed from a single continuous wire run through punched holes on the binding edge. A Wire-O binding holds the covers and pages of a document firmly in place by a wire inserted through holes drilled in their left edges. All of the document's pages lay flat when opened, can turn easily through 360°, and stay in perfect registration with adjoining pages.
Wire-O bound booklets can serve as an advertising production- product catalogue, restaurant menu etc. This printing product is very convenient to use and long term. It gives an opportunity to use very thick paper both for the cover and inside pages. Also there can be various kinds of papers in one booklet.
Wire-O with hanger
Wire-O binding is very popular for table calendars, as well as for wall calendars of size A3 or similar. The big format wall calendars have spiral binding with a hanger, it makes it easy to hang on the wall and thumb the pages.