Screw-on magnets have countersunk boreholes for easy mounting with screws. This makes the screw-on magnets suitable for hanging things like signs or tools. And because the magnets are only 4 mm thick they can be countersunk easily into the material. That will hide the magnet and also provide protection against blows as the screw-on magnet is brittle like all other neodymium magnets.
The screw-on magnets are often used as magnetic closures in kitchen closets, drawers etc. For this purpose you can use a metal plate as a counterpart for the screw-on magnet. You can find the metal plates by click on the link below.