... ,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 ... H,SH,UH,EH) etc.2. Working temperature for Ring shape NdFeB magnets:from 80 centigrades to 200 centigrades.3. ... here, welcome your inquiry, thanks. N50 large ring magnet