Neodymium Ring Magnet - 40mm (OD) x 16mm (ID) x 10mm (H) | N52This Rare Earth Ring Magnet features an outer diameter of 40mm, inner diameter of 16mm, and a thickness of 10mm. Made from Nickel plated N52 grade material, it offers an impressive pull force of 32. 59 kilograms. This magnet is identified by the AMF Magnetics part number 23002A. Surface Gauss: 2,469 gauss Surface Gauss (Centre Hole): 4,254 gauss Uses for Our Rare Earth Ring Magnets: These Rare Earth Ring Magnets are commonly used in processing and