... dimension Precise tolerance Neodymium Rare Earth Block Magnets with holes, N35,N38,N40,N42,N45,N48,N50,N52.. Product specifications:1. Neodymium ... rare earth block magnets with different grades of: N35 ... ,N38,N40,N42,N45,N48,N50,N52(M,H,SH,UH ...