This item will be shipped within One Week Returns Subject to 15% restocking Fee UC205-25mm-BLK Oxide Plated Insert Ball Bearing 25mm Inner Diameter UC205-25mm-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.