​Buy diametric ring magnets, welcome to consult the price to the permanent magnet manufacturer Courage. The product uploaded today is 18mm in the outer diameter, a pore diameter of 7mm, and a high radial magnet ring with a height of 27mm. On the side, it is more than 4000 Gaussia, because the magnetic force is too strong, we have pads and magnetic movies between two magnets, which are convenient for use....