... N35,N38,N40,N42,N45,N48,N50,N52(M,H,SH,UH,EH Largest size:OD170mm Ring shape with hole High coercive forceNeodymium Ring Magnet with N35,N38,N40,N42,N45,N48,N50 ... ,gradeProduct specifications:1. Ring NdFeB magnet with different grades of: N35,N38,N40,N42,N45,N48,N50(M,H,SH, ... always available here, welcome your inquiry, thanks. N50 large ring magnet