UC208-24 Black Oxide Plated Axle Bearing Insert Mounted 1-1/2"UC208 24 Black Oxide Plated Axle Insert Mounted Bearing 1 1 2" Inch Inner Diameter UC208 24 Black Oxide Plated Bearing Insert, bearing is Wide inner ring with spherical outer ring, Bearing is re lubrication groove with oil hole on set screw side. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. UC208 24 Black oxide plated insert Bearing Shaft