UC210-31 Black Oxide Plated Plated Insert 1 15/16 Bore BearingUC210 31 Black Oxide Plated Insert Ball Bearing 1 15 16" inch Inner Diameter UC210 31 Black Oxide Plated Insert Ball Bearing, bearing is wide inner ring with spherical outer ring, bearing is rel ubrication 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. UC210 31 Black Bearing Oxide Plated Insert Ball Bearing Shaft Diameter: 1 15 16" inch Dynamic load