This is a ring magnet with an outer diameter of 18mm, with 1 straight hole in the middle, the size of the hole is 4mm, the thickness of the ring is 9mm, the surface is nickel-plated, like this ring can be magnetized axially or radially, the use of different surfaces, depending on the application of your product, such as you need a quote or need us to process samples please send us an inquiry through the web page, thank you!
What you may need is this type of magnet;
18mm dia neodymium disc countersunk hole magnets 18x4.3x5mm
18mm diameter 20mm thick cylindrical magnet with countersunk hole