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Until you've handled a rare-earth magnet, it's difficult to appreciate just how powerful they are. Their strength has to do with the electron array in the neodymium, the rare earth they are made from. Over the years, our customers have told us about hundreds if not thousands of applications they have found for these magnets.
Rare-earth magnets are made of neodymium iron boron (NdFeB). Neodymium has one of the highest magnetic properties of any magnetic alloy. Good ones have an attractive power 1000 times the weight of the magnet. The smallest magnet we offer can lift a 2 1/2 lb block of steel; the largest will lift a 30 lb block. But sheer strength isn't all they've got going for them. Available in an array of shapes and sizes, they can be used in a remarkable variety of ways, from making workshop aids to kitchen knife holders, fridge knobs and cabinet latches.
While a magnet can be mounted to a non-ferrous surface with glue, setting it in a steel cup focuses the magnetic field and gives it up to four times the holding power. Once the cup is screwed in and the magnet inserted, there is little chance it will ever pop out. If you expect you'll need to remove it, first file a slot in the side of the cup so you can insert a small tool to pry out the magnet. You can mount the cup with wood screws or use a flat-head machine screw held with a nut from the other side; if you don't want the nut to project, counterbore it, and if the counterbore is deep enough, you can conceal it with a plug made with a Snug Plug cutter.