[Type & Size] : This is a 163110-2RS deep groove ball bearings, 16mm inner diameter, 31 outer diameter, and 10mm thickness.
[Durable Material] : Made of carbon steel material, high hardness, durability and long service life.
[Double Sealed] : Closed with shields to protect the bearings from dust or other foreign matter, and has the features of small friction and high-limit speed.
[Wide Application] : Deep groove ball bearings can be used in all kinds of industrial equipment and match the rear hubs of the bike.
[Package List] : Contains 4pcs deep groove ball bearings which pre-lubricated, easy to maintain.