25mm Bearing UCP205 Black Oxide Plated Insert Bearing + Pillow BlockUCP205 Black Oxide Plated Insert Bearing + Pillow Block Set Screw Type High Center Height 25mm Inner Diameter UCP205 Black Oxide Plated Insert Bearing + Pillow Block, UCP205 is Set Screw Type High Center Height, Inner Diameter is 25mm. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. UCP205Black Oxide Plated Insert Bearing + Pillow Block