Review on Powerful Neodymium Bar Magnets With Double-Sided Adhesive - Ideal For Home, Office & Scientific Uses - Pack Of 16 Magnets by Raymond Wade

As folks have said there are very strong and very difficult to separate - but that fine - you should expect that. On my AC power strips I have place 2 (sometime up to 4 on large ones) of these - using epoxy glue. Seems to work very well so far. hint: if you use epoxy use a small piece of tape to hold the magnet on during the initial drying - tends to move otherwise. I also take some "shoe glue" rubber cement and put a thin layer on the other side of the magnet - serves 2 purposes - prevents scratches and slippages. I have the things on filing cabinets, gun safes, anything metal. anywhere you want to hold an object to a metal object. The great thing is you can move them around.