Bearing UCP202 Black Oxide Plated Insert 15mm Pillow Block Mounted BearingUCP202 Black Oxide Plated Insert Pillow Block Bearing Cylindrical bore (with set screws) 15mm Inner Diameter This pillow type unit is designed to reduce mounting space, it is installed for machines with the two tapped holes on the bottom of the housing. 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 Black Oxide Plated Insert Bearing