Neodymium Ring Magnet 24 x 4.5 x 5 mm N48 with Countersunk Hole
 
The 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 shape is useful for shaft or screw mounting and precise alignment. The central hole helps with these applications. The corners are chamfered (recessed/bevelled edge), making installation easier and reducing the risk of chipping at the edges.
 
At Ø24/Ø4.5×5 mm, this magnet provides a strong hold for workshop use, assembly, alignment and technical projects. (Ø24/Ø4.5×5 mm) Holding force depends strongly on the thickness and condition of the metal surface. It is greater on thick steel and weaker on thin sheet metal.
 
Warning: keep away from children. Swallowing magnets can be life-threatening. Seek immediate medical attention if swallowing is suspected. Magnetic attraction is strong. Bring magnets together and separate them carefully to avoid pinching injuries and chipping. Keep them away from medical devices, cards and sensitive electronics.