This product is a small ring magnet with countersunk holes, the material is rare earth NdFeB, N38 grade, nickel-plated, the magnet size is 8mm in outer diameter, 3mm in thickness, and the tolerance is ±0.05mm. If you need to buy small size magnets with countersunk holes, please contact We quote for you, the source factory, the price is affordable, the quality is guaranteed....