Item: MR689 CEStructure: Deep GrooveMaterial: ZrO2 CeramicBore Dia (d): 9 mmOuter Dia (D): 17 mmWidth (B): 5 mmClosures: /Lubrication: /Magnetic: littleHardness: 58HRCCorrosion Resistance: GeneralClearance: C0Grades: ABEC-7