5/8" Bearing UCP202-10 Black Oxide Insert + Pillow Block Cast Housing Mounted BearingsUCP202 10 Black oxide Insert + Pillow Block Bearing Set Screw Type High Center Height 5 8" inch Inner Diameter UCP202 10 Black Oxide Insert + Pillow Block Bearing, UCP202 10 is Set Screw Type High Center Height, Inner Diameter is 5 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: UCP202 10 Bearing Type: Pillow Block Mounted Bearing