Set of 2 magnets 1/2" OD x 1/4" ID x 1" thick (12.7 mm x 6.4 mm x 25.4 mm) Material: Neodymium (NdFeB) Grade: N48 Coating: Nickel (Ni) Magnetization: Axial SKU# M12141T OD = Outder Diameter ID = Inner Diameter NEODYMIUM MAGNETS ARE NOT SAFE FOR CHILDREN