Set of 10 magnets 3/4" OD x 1/8" ID x 1/8" thick (19.1 mm x 3.2 mm x 3.2 mm) Material: Neodymium (NdFeB) Grade: N48 Coating: Nickel (Ni) Magnetization: Axial Pull Force: 7.64 pounds SKU# M341818R OD = Outder Diameter ID = Inner Diameter