2 1/4" Bearing UCP212-36 Black oxide Plated Insert + Pillow Block Cast Housing Mounted BearingUCP212 36 Black oxide Plated Insert Pillow Block Bearing Set Screw Type High Center Height 2 1 4" Inner Diameter UCP212 36 Black oxide Plated Insert Pillow Block Bearing, UCP212 36 is Set Screw Type High Center Height, Inner Diameter is 2 1 4" 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. UCP212 36 Black oxide Plated Insert Bearing +