round magnets all grades:N35,N40,N42,N45N48N52,M,H,SH,UH ... Zn,Epoxy neodymium rare earth round magnets with holes, all grade material available,Any size Product specifications:1. ... rare earth round magnets with holes are with material grades of N35,N38,N40,N42,N45,N48,N50,N52( ... high working temperature, as high as 200 centigrade.All These special features of NdFeN material make it irreplaceable ...