You go to a big fair or congress and gets many business cards and need to keep them organized and grouped by type of company or business segment. Nothing better than a portable business card riveter. It is simple to use. First you put the cards face down inside the riveter then press the left button to drill it. After, pull out the cards, reinsert it now upside up and press the right button to rivet it. Now all cards are jointed. The rivet can be aluminum or plastic being fueled by the central window.