Recommended system for holding parts in situations with very small spaces, where large forces are required.
These cylinders have an axial magnetization, since they have north and south poles that are at the top and bottom, very similar to the needle of a compass.
They could be the most used because their applications are the best known. The first could be to attach documents or photos in the refrigerator or magnetic panels.
Another application could be to place it inside the drill and hold the coupled parts on both sides.