Poster board holder

This works well with poster board. The poster board I used was about 0.45 mm and the thickness of the slot is about 0.65 mm. It isn't super deep so the poster board can slip out but if you are careful you can slide this and make a little photo background/area/booth for taking photos.The photos attached are to show off how the background looks with these attached to them. Ignore the Ogre/animals.