Grade 42 neodymium hooks provide amazing strength in a small size. Use these industrial strength hooks to hang tools, equipment, lights, and other items in warehouses, manufacturing facilities, garages, work stations, and areas where a strong, small hook is needed. All magnets are not created equal. Neodymium magnets are a permanent type of Rare Earth Magnet, made from neodymium, iron, boron and other transition elements. Affordability & availability contribute to this strong magnet's growing popularity. These are the strongest permanent magnets on the market today. Grade N42 offers high performance at an economical price.