Looks perfect for farmers.
Farmers?
People who raise livestock sometimes discover that their animal has ingested a metallic object like a screw, bolt or piece of wire. So they feed a magnet to the animal. Once the metallic bit clings to the magnet, it gives the alimentary canal some push to get the thing out.
This is not without risk, either. The magnet can cling to the object in one fold of the intestine, while it is actually in another that is adjacent. This can cause bowel rupture - but the animal is likely to have a bowel rupture with the hardware inside anyway.
Ah, the 1001 uses for magnets...