I used these to mount a spice rack on the side of my fridge, and it was easy to use them through holes normally meant for drywall mounts. The rubber won't harm the fridge, although I found it did not provide enough friction to keep the rack from sliding down the fridge, even though I was well under the 120-lb total weight pull of the magnets. A little double-sided tape fixed the problem. I would definitely buy these again.
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