... ,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 ... super strong magnetic force and high intrinsic coercive force.6, With precise tolerance.Application for NdFeB magnet:Magnetic separator, Sensors, Wind ...