- R240612N45Dimension: 3/4" od x 3/16" id x 3/8"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$4.36R240808N52Dimension: 3/4" od x 1/4" id x 1/4"Material: Sintered Neodymium MagnetGrade: N52Coating: NiCuNi(Nickel)$4.36