612-5767, NMB, NMB DDL-840ZZHA1P25LY121 Double Row Deep Groove Ball Bearing- Both Sides Shielded 4mm I.D, 8mm O.D, Brand NMB, Inside Diameter 4mm, Outside Diameter 8mm NMB DDL-840ZZHA1P25LY121 Double Row Deep Groove Ball Bearing- Both Sides Shielded 4mm I.D, 8mm O.D