SureBind Strips can be used with GBC SureBind machines which offer a choice of two binding formats to suit different machine types and office environments. The Surebind 10-prong formats are for permanently bound, tamper-proof legal or contractual documents. They can hold up to 750 pages and once pushed through the page holes are welded securely in place. In addition, the Surebind 10-prong format allows the secure re-binding of 21-hole documents originally bound using CombBind.