This item will be shipped within One Week Returns Subject to 15% restocking Fee SSUCF211-55mm Stainless Steel Flange Units 4 Bolt Set Screw Locking 55mm Inner Diameter SSUCF211-55mm Stainless Steel Flange Units 4 Bolt Ball Bearing, SSUCF211-55mm is Set Screw Locking, bearing has solid base housing construction, bearing has wide inner ring, bearing is relubricatable unit with anti-rotation pin, bearing has supplied with water and wash resistant mobilgrease.