Jam Free Guaranteed when used with Optima or S.F. 4 Premium staples.Staples 25% more sheets than standard staplers.25-sheet stapling capacity when used with recommended staples.Built-to-last metal construction.Features performance-driven mechanism and inner rail for better staple alignment and fewer misforms.Stapler opens for tacking ability; anvil rotates for pinning, to create temporary staples.100% Performance Guarantee when used with recommended staples.