30mm Bearing UCP206 Black Oxide Plated Insert+ Pillow Block Cast Housing Mounted BearingUCP206 Black Oxide Plated Insert + Pillow Block Bearing Set Screw Type High Center Height 30mm Inner Diameter UCP206 Black Oxide Plated Insert Pillow Block Bearing, UCP206 is Set Screw Type High Center Height, Inner Diameter is 30mm. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. UCP206 Black Oxide Plated Insert Bearing + pillow Block