Item: MR85 RSStructure: Deep GrooveMaterial: Bearing SteelBore Dia (d): 5 mmOuter Dia (D): 8 mmWidth (B): 2.5 mmClosures: Rubber SealLubrication: GreaseMagnetic: littleHardness: 58HRCCorrosion Resistance: GeneralClearance: C0Grades: ABEC-7