This item will be shipped within One Week Returns Subject to 15% restocking Fee ZUC204-20mm Zinc Chromate Plated Insert Ball Bearing 20mm Inner Diameter ZUC204-20mm Zinc Chromate 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, it has supplied with water/wash resistant mobilgrease.