1 1/2" Bearing UCP208-24 Black Oxide Plated Insert + Pillow Block Cast Housing Mounted BearingsUCP208 24 Black Oxide Plated Insert Pillow Block Bearing Set Screw Type High Center Height 1 1 2" inch Inner Diameter UCP208 24 Pillow Block Bearing, UCP208 24 is Set Screw Type High Center Height, Inner Diameter is 1 1 2" 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.. Item: UCP208 24 Black Oxide Plated Insert Bearing + Pillow block