Neodymium Cylinder Magnet - 50.8mm x 50.8mm | N48Magnetic Product Description: This neodymium cylinder magnet has a diameter of 50. 8mm and a height of 50. 8mm. Identified by AMF magnet part number 21003. Uses for our rare earth cylinder magnets: Magnets have always played an important part of electronics equipment, including vital communications technologies. radios, like all electronics equipment contain magnets, including neodymium cylinder 50. 8mmx50. 8mm magnets. Magnets find many uses