This product is a large annular neodymium magnet, made of rare earth NdFeB, with galvanized surface, 2 holes are punched on the edge of the ring according to customer requirements, and some customers need to punch 3 holes. It is suitable for industrial, mechanical equipment, experiments, etc., such as You need to buy such large neodymium ring NdFeB magnets, welcome to contact Kariqi magnet manufacturer to customize for you....