Working temperature 176 f (80 c) Tolerance: all magnets dimensions are +/-0. 002 in with coating Grade N42 neodymium (magnets strongest permanent magnets made on magnets planet today) Applications tool hangers decorations towel hangers knife holders refrigerator magnets scrap books DIY recoup storage space theater props ceiling & wall treatments gun mounts doors under a bar string magnets displays trade shows mounting magnets retrieval door latch cabinet magnets if a magnet attaches to another magnet they can be very difficult to separate magnetics s. These neodymium N42 magnet discs are 10-15 times magnets force