Neodymium Magnet in Steel Housing with Countersunk Hole 80 x 13 x 5 mm. 
 
An NdFeB (neodymium) magnet provides high magnetic attraction for its size, making it useful for technical projects and practical attachments. Its magnetic attraction is greater than that of ferrite magnets, and the surface coating helps reduce corrosion. The N indicates the magnetic grade. NdFeB grades commonly range from N35 to N52, with higher numbers generally indicating stronger magnets. The with Hole design for mechanical attachment, allowing screw mounting without adhesive.
 
The larger size suits demanding tasks such as strong attachments, assembly and robust projects, with careful handling. Holding force depends strongly on the thickness and condition of the metal surface. It is greater on thick steel than on thin sheet metal. Use moderate tightening force, avoid overtightening and use a washer where possible. Impacts or excessive clamping pressure can crack the magnet.
 
Warning: keep away from children. Strong attraction can cause pinching injuries, and the magnets may break. Store them with spacers. Keep them away from bank cards, sensitive electronics and medical devices.