- R560816N45Dimension: 1 3/4" od x 1/4" id x 1/2"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$34.98R481616N45Dimension: 1 3/4" od x 1/2" id x 1/2"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$34.98