Neodymium Ring Magnet 8 x 4 x 5 mm N48
 
Neodymium (NdFeB) is among the strongest magnetic materials. The ring shape is practical because its central hole helps with mounting and alignment. Alongside high magnetic attraction, the surface coating helps improve durability. N48 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.
 
The Ø8/Ø4×5 mm ring is useful for DIY projects, including lids, boxes, small holders and shaft or screw mounting. (Ø8/Ø4×5 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. Magnets can snap together quickly and pinch fingers. They are hard but brittle, so do not allow them to collide. Keep them away from bank cards, sensitive electronics and medical devices such as pacemakers.