The N52P312125 N52 Neodymium Disc Magnet from Bunting measures .312″ Diameter, .125″ Thickness, and has a Holding Force of 4.14 lb. Neodymium magnets are the most widely used rare earth magnets and are an excellent choice in any application where strong permanent magnetics are required. Their immense strength allows for the magnet itself to be smaller and lighter. Our strong N52 Neodymium Disc Magnets are plated and come in a wide range of sizes with an equally wide range of holding forces to perfectly suit your needs. Neodymium magnets are a member of the rare earth magnet family, and are the most permanent magnets in the world. They’re composed of Neodymium (Nd), Iron (Fe) and Boron (B), which makes them vulnerable to rust if they’re exposed to the elements. To protect the magnet from corrosion and to strengthen the brittle magnet material, the neodymium magnet is usually coated with nickel. Neodymium magnets have a wide variety of uses, which makes perfect sense considering they’re extremely strong, and affordable. Here are just a few of the ways you’ll see neodymium magnets applied to everyday life: Electronics, Industrial applications, Clamps, Green Energy, Healthcare, Oil Filters, Stud Finders, Magnetic Therapy, Closers, Remagnetization, Metal Detectors, and much more!