This is a customized 2.5 inches powerful ring magnet, material is rare earth neodymium, the outer diameter of the ring 65mm, hole 46mm, thickness 8mm, the surface of the conventional nickel-plated treatment, such as harsh environments you can choose other plating, such as black epoxy, suitable for industry, large mechanical equipment, high quality audio speakers, according to your actual needs of the size of the processing.
Schematic diagram of the dimensions and magnetization direction of a larger ring rare-earth magnet 65x46x8mm
Other 65mm magnets;