UC207-21 Black Oxide Plated Plated Insert 1 5/16 Bore BearingUC207 21 Black Oxide Plated Insert Ball Bearing 1 5 16" inch Inner Diameter UC207 21 BLK Oxide Plated Insert Ball Bearing, bearing is wide inner ring with spherical outer ring, bearing is relubrication groove with oil hole on set screw side, bearing is anti rotation pin on side opposite grease groove, bearing is nylon patched class 3A set screws. Item: UC207 21 Black Bearing Type: Oxide Plated Insert Ball Bearing Shaft Diameter: 1 5 16" inch Dynamic