The magnet covered with steel cup is called cup magnets. According to the difference of the inner magnets and steel cup,cup magnets are given different names. Counterbore cup magnets composed of ring shape magnets and flat steel cup which made with smaller holes in the center. Counterbore cup magnets can be fixed onto any other object surface to hold metal objects. Because of the nice magnetic strength,neodymium counterbore cup magnets are the first choice as holding magnets.