Applied Magnets 4" x 2" Grade N42 Neodymium Disc Magnet Top Quality Rare Earth Neodymium Magnets N42 Grade. Nickel-Copper-Nickel triple layer coated for durability and excellent protection against corrosion Estimated Pull Force: 880 lbs, Great performance, Wholesale Price. 4" wide x 2" thick, magnetized through thickness. Quantity: 1 Neodymium Magnet.