CMS Magnetics N45 OD1.5" x ID0.203" x 1/2" Rare Earth Neodymium Ring Magnet. One Piece Powerful Permanent Magnets: Incredible Holding Power for its Size, Grade N45 - 69 lb Per Magnet Under Ideal Conditions, 13,500 Internal Gauss Numerous Applications: Useful Magnets for Holding, Home Improvement, DIY Projects and Much More Best Coating Available: Ni+Cu+Ni Triple Layer Coated. Shinny and Corrosion Resistance Top Quality: These are the Highest Quality Magnets Made under ISO 9001 Quality Control Systems. All Tolerances are +/-0.002" Quality Guaranteed and 30 Days Money Back Guaranteed