UC211-32 Black Oxide Plated Insert 2" Bore Mounted BearingUC211 32 Black Oxide Plated Bearing Insert Set Screw Locking 2" Inch Inner Diameter UC211 32 Black Oxide Plated insert , Bearing is standard duty, bearing is Wide inner ring with spherical outer ring, Bearing is relubrication groove with oil hole on set screw side, bearing is nylon patched class 3A set screw, Standard seal is R Seal. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add