10Pcs 20x3mm NdFeB Neodymium Magnet with 3mm Hole Countersunk Round Ring Magnets

Descriptions 10Pcs Neodymium Magnet 20x3mm NdFeB Super Strong Craft Countersunk Round Ring MagnetsSpecifications Shape RoundMaterial NdFeB magnetSize DX H 20mm x 3mmHole Dimeter 3mmQuantity 10pcs setFeatures Neodymium chemical symbol Nd is element 60 on the periodic table It is a rare earth metal and forms one of the Lanthanides series When added to Iron Fe and Boron B chemical formula Nd14Fe21B the resultant magnets are the Strongest magnets currently available Neodymium magnets are sometimes known as Neo Neod or NIB magnets Neodymium magnets are usually coated Nickel Copper Nickel plating to prevent the iron from rusting Neodymium block magnet was made of NdFeB have strong magnetic performances and appearance does not rust usually placed in room temperature the maximum operating temperature is 80 C and it never will demagnetization Applications 1 Acoustic Field the speaker receiver microphone alarm stage audio car audio and so on 2 Electronics permanent magnetic actuator vacuum circuit breakers magnetic relays meter meter sound meter a reed switch sensors 3 Electrical Field CD DVD ROM generators motors servo motors micro motors motors vibration motors 4 Machinery and Equipment magnetic separation magnetic machinery 5 Healthcare medical equipment magnetic health products and so on 6 Other industries magnetized Wax pipe descaling magnetic fixture automatic mahjong machine magnetic locks doors and windows magneti