Set of 1 magnet 3" OD x 1" ID x 1/2" thick (76.2 mm x 25.4 mm x 12.7 mm) Material: Neodymium (NdFeB) Grade: N48 Coating: Nickel (Ni) Magnetization: Axial Pull Force: 97.87 pounds SKU# M3112R OD = Outer Diameter ID = Inner Diameter