... ,Zn,Epoxy N35,N38,N40,N42,N45,N48,N50,N52 round magnets with holes, Any size Product specifications:1. neodymium rare earth ... round magnets with holes are with material grades of N35,N38,N40, ... ,N50,N52(M,H,SH,UH,EH) etc.2. Working temperature for neodymium round magnets with holes:from 80 centigrades to 230 centigrades ...