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SOUTH POLE on countersunk hole. Matches Item: 3581N OD20 x ID5.2 x 4mm thick
Strong countersunk ring magnets sized specifically for flat head screws. The south pole is on the side of the magnet with large countersunk hole, where the head of the screw would be.
These countersunk rings can be used for a wide range of applications including door closures and tool hangers.