- R240824N45Dimension: 3/4" od x 1/4" id x 3/4"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$10.48R240824N52Dimension: 3/4" od x 1/4" id x 3/4"Material: Sintered Neodymium MagnetGrade: N52Coating: NiCuNi(Nickel)$12.23