Performance driven stapling mechanism and inner rail always delivers jam-resistant, accurate stapling. 100%Performance Guarantee when used with S.F.® 4® Premium Staples.• This stapler is made for even your biggest jobs. The durable construction with die-cast metal base stands up todaily wear and tear.• 30 sheet stapling capacity when used with Swingline S.F.® 4® Premium Staples• Customize the way you staple. A button latch allows the stapler to swing open for tacking. Ideal for staplingposters or documents to bulletin boards.• Anvil rotates for pinning ability to create temporary staples• Positive locking latch secures staple position• Limited lifetime warranty