This product is a countersunk hole ring magnet, hole is 4mm, outer diameter 12mm, thickness 5mm, is a more conventional dosage of countersunk head ring screw hole magnet, countersunk hole design allows the magnet to be embedded in or embedded in the metal surface, used for a variety of fixed, positioning and other applications, such as you want to smaller or larger sizes can be contacted customer service to find the specifications of the spot for you to support customized according to the drawings.
Other 12mm rare earth sink hole magnets;
12mm x 6mm rare earth magnet with countersunk hole 3mm
Introduction of related countersunk magnets;
Why ring neodymium magnets need to process countersunk hole shape?