Item: MR126ZZStructure: Deep GrooveMaterial: Bearing SteelBore Dia (d): 6 mmOuter Dia (D): 12 mmWidth (B): four mmClosures: Metal SealLubrication: GreaseMagnetic: littleHardness: 58HRCCorrosion Resistance: GeneralClearance: C0Grades: ABEC-7