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, also known as spiral coil or color coil, is a popular form of document binding that joins the pages and cover of a book using a plastic coiled spine. twisted coil is threaded through small holes punched along the spine edge of the book, then cut and crimped at the ends to secure it in place and prevent the coil from unwinding. Coil binding is extremely durable and provides a professional-looking finish for books. Sp
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