I have a lot of ideas and I have big whiteboards to draw them on. However I kept losing dry erase pen caps at my office and a few ideas never got off the ground because I could not find a working pen. So I invented this little cap and pen holster and it works great. No more lost caps and pens stay put. The caps just snap in first time and are locked in place. Screw to any surface or glue to your whiteboard.