Neodymium Ring Magnets are like discs or cylinders, but with a center hole. Most ネオジムリング磁石 and tube-shaped magnets are axially magnetised: North and south poles are located on the flat circular surfaces (“上と下”). The few diametrically magnetised neodymium ring magnets with poles “左右” are specifically marked.

Due to their shape, it is very tempting to screw-mount ring magnets. But please keep in mind, the material is very brittle and chips easily. That is why we advise against the screw-mounting of ring magnets with holes. It is much safer and easier if you use screw-on magnets または countersunk pot magnets.