The catch is not perfectly finished, in fact - but unscrewed.
Who would not like thus necessarily have a hook that can substitute for a bolt with M4 threaded him, which makes the use of this article even more interesting.
Such magnetic-hook hanging on the refrigerator or a clothes dryer can easily slip through the smooth surface and leave scratches in the paint - the adhesive force finally refers to a horizontal train and not the vertical train by hanging on a hook object.
I've helped me with fabric adhesive tape.
It is thin, so that the magnet is close to the iron and offers by the rubbing-resistance a better fit against slipping wet towels including magnetic hook.
Felt glides with adhesive surface are also an option for even stronger magnets - they are also likely to dampen the "impact" of the magnet.