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These cup magnets are made for holding purposes. They are made of strong grade 8 ceramic magnets embedded in steel cups. The steel cups close the magnetic circuits on one pole of the magnets so to increase the holding power on the opening side. The steel cups also protect the magnets from breaking when a regular magnet may break easily under impact. Each of these cup magnets provides a 28 pounds of holding power for a direct pull on a 3/4" thick low carbon steel. An inner threaded stud is built into the steel cup for fixture purposes. The diameter of the cup is 1.57 inches.Not the magnets you played with as children 15-20 times the force of those old time magnets. Never experienced powerful Neodymium magnets? Now is the time! Our Ceramic cup Magnets high saturation magnetization & tetragonal crystalline structure ensures top physical pulling force & maximum energy product The Ultimate Strength Magnets For Sale In The USA Today! Grade tested accurate & guaranteed These super strong magnets for sale at great prices all have a redline inscribed north pole for easy identification These are permanent Ceramic cup magnet & last 100 years Users School Teachers Machinists Magicians Students Hobbyists Inventors technicians DIYers Mars Rovers (yup up there) Craft magnets Uses Hobbies Therapy Storage Experiments Science Fairs Labs Garages Schools Offices Magic shops garages parking lots material handling industrial & scientific Applications Tool hangers decorations towel hangers knife holders refrigerator magnets scrap books Recoup storage space theater props ceiling & wall treatments gun mounts string magnets displays trade shows retrieval door latches cabinet magnets round base magnets strong