This item will be shipped within One Week Returns Subject to 15% restocking Fee UC201-8-BLK Oxide Plated Insert Ball Bearing 1/2" inch Inner Diameter UC201-8-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.