Made of neodymium, the stepped rare earth magnets are the strongest for their size. They, as mountable magnets, are ideal for magnetic fastening.
Custom stepped magnets usually include both an inner concave (which can also be called a groove) and an outer convex form. Using with mechanical means, they are like the mortise and tenon joinery used in Chinese woodworking.
This specific magnet shape provides an excellent connecting solution for many applications. No glue or screws are needed, and the magnet can be firmly installed in the designated position.
For example, it’s easier to insert and secure into plastic mold.