1 3/8" Bearing UCP207-22 Black Oxide Plated Insert + Pillow Block Cast Housing Mounted BearingsUCP207 22 Black Oxide Plated Insert + Pillow Block Bearing Set Screw Type High Center Height 1 3 8" inch Inner Diameter UCP207 22 Black Oxide Plated Insert + Pillow Block Bearing, UCP207 22 is Set Screw Type High Center Height, Inner Diameter is 1 3 8" inch. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance.. Item: UCP207 22 Black Oxide Plated