This item will be shipped within One Week Returns Subject to 15% restocking Fee UC211-34-BLK Oxide Plated Insert Ball Bearing 2 1/8" inch Inner Diameter UC211-34-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.