In reviewing the craft, I would think you could glue strong magnets to the back of the ruler but you could contact the contributor at http://www.ilovetocreate.com/ProjectDetails.aspx?name=Jean-ious+Pocket+Organizer to see how they attached it. Not sure if locker has something for the ruler to sit on. It’s been a long time since I was in school. LOL Thank you for your comment. I’ll be interested in the response.