5/8" Bearing UCP202-10 Black Oxide Insert + Pillow Block Cast Housing Mounted BearingUCP202 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. UCP202 10 Bearing Pillow Block Mounted Bearing Bolt Size: 3