40mm Bearing UCP208 Black Oxide Plated Insert + Pillow Block Cast Housing Mounted BearingUCP208 Black Oxide Plated Insert Pillow Block Bearing Set Screw Type High Center Height 40mm Inner Diameter UCP208 Black Oxide Plated Insert Pillow Block Bearing, UCP208 is Set Screw Type High Center Height, Inner Diameter is 40mm. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. UCP208 Black Oxide Plated Insert Bearing + Pillow Block Housing