Generally our searching magnet is composed of an outer round cup steel and a ring neodymium magnets inside with a hole in the centre or a disc magnets, which has been broadly applied into fishing application.
The inner magnet of cup magnets could form a special magnetic circle with the the housing steel when putting it on an ferrous material surface, which is much be strongger than the the magnet self can do. At the same time, the outer cup steel can prevent the inside magnets from damaged or crushed. In some of applications, it can be filled with Epoxy between the cup steel and the magnet to stop some iron dust adsorbed into the gap.
Please find more specifications as showing as bellows. Also your special designs could be avaiable for us.
In case any question or needs about searching magnets, please feel free to contact us!