They are also known as ‘shallow pot magnet with countersunk hole’. They are one of the most regular bought pot magnets. One reason that people like to use them is that they are friendly in mounting. By using a flat-head screw bolt you are good to go!
Common use includes fastening them in workshop, garage to hold tools, or in the basement on the wall in front of your working table to hold small gadgets. Besides, the plastic cased countersunk pot magnet is decorative with its white color and you might want to use them in, such as office, showroom.
They can be used as bases --- put in a flat head screw and screw something on with matching thread on the other side such as a warning light, for example.
If you need them to be tailored to some extent to match your unique application situation feel free to let us know and we will be glad to develop something for you.