Item: 699 RS Structure: Deep Groove Material: Bearing Steel Ball Material: Bearing Steel Bore Dia (d): nine mm Outer Dia (D): 20 mm Width (B): 6 mm Closures: Rubber Seal Lubrication: Grease Magnetic: little Hardness: 58HRC Corrosion Resistance: General Clearance: C0 Grades: ABEC-7