This is a Refrigerator magnet that holds business cards, coupons, etc.
I've included the .123dx file for remixing in 123D Design.
It uses three 19 mm magnets that can be found here:
http://www.michaels.com/10307910.html#q=magnet&start=7
Card_Holder.123dx | 232.0KB | |
Card_Holder.stl | 3.0MB |