UC218 Black Oxide Plated Axle Bearing Insert 90mm MountedUC218 90mm Black Oxide Plated Axle Bearing Insert 90mm Inner Diameter 90mm x 160mm x 96mm UC218 90mm Black Oxide Plated Bearing Insert, Bearing is standard duty, bearing is wide inner ring with spherical outer ring, Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. UC218 Black Bearing Insert Black Oxide Plated Bearing Insert Shaft Diameter: