The Swingline 747 Business Stapler comes with a metal cap and an all-metal die-cast base for durability and stability. Designed for long-term office use, the stapler also comes with an inner rail for jam-resistant stability and long-term stapling integrity. It can handle stapling up to 20 sheets of 20 pound paper when used with Swingline"s S.F. 4 premium staples. A positive locking latch ensures the confidence and control of a secure stapling position. For added versatility, the stapler can easily swing open to provide full tacking flexibility. The Swingline 747 is backed by a manufacturer"s limited lifetime warranty. Swingline, a leading brand in workspace tools for the business, home and mobile office for over 80 years continues to introduce new staplers, sharpeners, punches and trimmers that solve common workplace frustrations and increase productivity. With unmatched quality, durability and performance, Swingline products are truly designed for the way you work!