Spiral bindings are made of either plastic or wire and allow the printed document to lie flat. Pages can also be folded back to 360 degrees without damage to the spine. These are useful characteristics for documents such as technical manuals, notebooks, and calendars.
Spiral binding allows play—hence registration inconsistency—between pages. One cannot add pages to documents once they are spiral bound. Also, rough handling may crush the spirals. Spiral wire coils range from 1/4" to 2" in diameter. They can bind books of up to 24" in length. Plastic coils also may be used as a binding medium.
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