... ring NdFeB magnet 2.ring NdFeB magnet 3.custom size&grade&coating 4.best price 5.timelu delivery counterbored/countersunk ring NdFeB magnet Ring ... .Magnet AH-(N28AH, N30AH, N33AH)working temperature:220 degree Celsius.2.Surface Treatments: Zinc, Nickel, Nickel+Copper+Nickel, Epoxy, Gold ... Passivation, any coating as you like.3.Magnet shape: Block,Ring, Arc,Disc, Cylinder, Rod,Bar, Cube,Sphere,Strip etc. ...