Set of 1 magnet 3" OD x 2" ID x 1" thick (76.2 mm x 50.8 mm x 25.4 mm) Material: Neodymium (NdFeB) Grade: N48 Coating: Nickel (Ni) Magnetization: Axial Pull Force: 97.86 pounds SKU# M321R OD = Outer Diameter ID = Inner Diameter