What is spiral (coil) binding?

Spiral binding threads a single plastic or metal coil through a row of punched holes along one edge. The coil lets the document flex freely, so it can lie completely flat or fold all the way back on itself.

• Lies flat: pages open flat, which is handy for hands-free reference.
• Folds back: it can wrap fully around so only one page shows at a time.
• Best for: manuals, notebooks, cookbooks, and calendars.