GBC ProClick Binding Spines, 5/16in, 50-Sheet Capacity, Black, Pack Of 25

Easy to use - no machine required for editing! After you have punched your documents with the GBC ProClick (or any 32-hole wire punch machine), the spines simply snap together. The pages turn easily and lie flat. Its fun, easy to use and doesnT require a machine to bind - so you can add and remove sheets anytime.