These large discs are crazy strong. Only purchase these discs if you know what you are doing and well versed in handling very powerful neodymium magnets. Two of these stuck together are virtually impossible to separate by hand. They can pinch quite hard and cause physical harm if they are not handled with extreme care and respect. One of these discs has a pull force of over 90 lbs if attached to a steel plate.
This size is also available in grade N52 as part number DX8C-N52