Item: R8ZZStructure: Deep GrooveMaterial: Bearing SteelBore Dia (d): 12.7 mm Outer Dia (D): 28.575 mm Width (B): 7.938 mm Closures: Metal SealLubrication: GreaseMagnetic: littleHardness: 58HRCCorrosion Resistance: GeneralClearance: C0Grades: ABEC-7