These custom molded wall hangers lock into a cap hole and hold your map away from the wall creating the stunning shadow effect shown in many of our product images. Simply screw the hanger into a stud with two screws (not included) and pop your map into place. When you are ready to add more caps, pull the map off of the hanger. A single hanger will hold your map, using the nubs to keep it from rotating. There is a high strength magnet inside that will hold a cap on top of the hanger so you won't lose a precious hole. See our FAQ for more info.