I have had 2 of these hole punches where the bar that depresses the puncher has had the rivot break and the bar then does not work and the unit is garbage. I have not been able to punch 28 pages consistently without weaking or breaking the rivot. I would suggest that they change it to be 20 pages as the magic number of pages it will consistently punch. One of these hole punches will last me a year or 2 good thing there are inexpensive!