Classically designed stapler with performance-driven stapling mechanism and inner rail always delivers jam-resistant, accurate stapling. Metal construction and die-cast base provide maximum durability. 20-sheet stapling capacity with Swingline S.F.® 4® Premium Staples. Stapler opens for tacking ability. Anvil rotates for pinning ability to create temporary staples. A positive locking latch secures a staple position. 100% Performance Guarantee.