3. Drill two shallow holes in the top and bottom of the back each frame. Insert the magnets into the holes so that the surface of the magnet is flush with the frame. Most of the magnets will fit snugly enough to secure them. If any come loose, apply a dab of super glue in the hole before reinserting the magnet. (Note: I tried hot glue first. It doesn’t work as well as super glue.)
4. Replace the glass, insert the photo, and reattach the original backing. Stick them onto any metal surface that’s magnetic. Using four of these strong magnets on each frame keeps them securely affixed, even when the refrigerator door gets slammed.