Item: S6902 RS CB Structure: Deep Groove Material: Stainless Steel Ball Material: Ceramic Si3N4 Bore Dia (d): 15 mm Outer Dia (D): 28 mm Width (B): 7 mm Closures: Rubber Seal Lubrication: Grease Magnetic: little Hardness: 58HRC Corrosion Resistance: General Clearance: C0 Grades: ABEC-7