1-5/8" Bearing UCP209-26 Black Oxide Plated Insert + Pillow Block Cast Housing Mounted BearingUCP209 26 Black Oxide Plated Insert + Pillow Block Bearing Set Screw Type High Center Height 1 5 8" inch Inner Diameter UCP209 26 Black Oxide Plated Insert + Pillow Block Bearing, UCP209 26 is Set Screw Type High Center Height, Inner Diameter is 1 5 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. UCP209 26 Black Oxide Plated Insert