... ,N40,N42,N45,N48,N50,N52 round magnet with custom hole guaranteed quality NiCuNi,Zn,Epoxy N35,N38,N40,N42,N45,N48,N50,N52 ... temperature for neodymium round magnets with holes:from 80 centigrades to 230 centigrades.3. Can be magnetized through thickness or diameter or multipoles ...