2 1/2" Inch Bearing UCP213-40 Black Oxide Plated Insert + Pillow Block Cast Housing Mounted BearingsUCP213 40 Black Oxide Plated Insert Pillow Block Bearingt 2 1 2" Inch Inner Diameter UCP213 40 Pillow Block Bearing, UCP213 40 is Set Screw Type High Center Height, Inner Diameter is 2 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: UCP213 40 Black Oxide Plated Insert Bearing + Pillow Block Type: Pillow Block Mounted Bearing