Pot Magnets
Pot Magnets with Countersunk, Pot Magnets with Hook, Pot Magnets with Threaded Stem

Pot Magnet is made by the combination of Neodymium magnet, embedded in a steel pot, with countersunk, or hook, or threaded stem for high attraction strength.
If the required attraction strength is lower, ferrite magnet could be used as alternate option.