Applied Magnets 1.5" x 1/2" with 1/4" Hole Grade N45 Neodymium Disc Magnet Top Quality Rare Earth Neodymium Magnet Nickel-Copper-Nickel triple layer coated for durability and excellent protection against corrosion Estimated Pull Force: 72 lbs. Poles are on the flat surfaces with the hole. Neodymium Magnets 1.5 inch Diameter x 1/2 inch Thick with 1/4 Countersunk Hole. Strong Neodymium Magnet Grade N45, stronger than N42, N40, N38 and N35.