Neodymium Ring Magnet 20 x 6.5 x 3 mm N35
 
Neodymium (NdFeB) is among the strongest magnetic materials. The ring shape is practical because its central hole helps with mounting and alignment. It is much stronger than conventional ferrite magnets and generally has a protective coating because the material can corrode over time. N35 indicates the magnetic grade. NdFeB grades commonly range from N35 to N52. The ring magnet fits readily into a recess or around a hole and can be used on a shaft or screw, or as a spacer.
 
A good choice where stronger holding force is needed and a ring that fits over a shaft or screw is useful. (Ø20/Ø6.5×3 mm) Paint, film or gaps noticeably reduce magnetic attraction. The magnet performs best on a flat, clean surface.
 
Warning: not suitable for children. Swallowed magnets can cause serious injuries. Seek urgent medical attention. Magnetic attraction is strong. Bring magnets together and separate them carefully to avoid pinching injuries and chipping. Keep them away from bank cards, sensitive electronics and medical devices such as pacemakers.