1 1/8" Bearing UCP206-18 Black Oxide Plated Insert Pillow Block Cast Housing Mounted BearingUCP206 18 Black Oxide Plated Insert Pillow Block Bearing Set Screw Type High Center Height 1 1 8" inch Inner Diameter UCP206 18 Black Oxide Plated Insert Pillow Block Bearing, UCP206 18 is Set Screw Type High Center Height, Inner Diameter is 1 1 8". 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: UCP206 18 Black Oxide Plated Insert