This item will be shipped within One Week Returns Subject to 15% restocking Fee RCSMRFZ-20mmL Flange Rubber Insulated Pressed Steel Ball Bearing Eccentric Locking Collar 20mm Inner Diameter RCSMRFZ-20mmL Flange Rubber Insulated Pressed Steel 2 Bolt Ball Bearing, Bearing is one piece and light duty pressed steel housing, RSCM Conductive rubber liner reduces noise and vibration, flush mount style ideal in tight mounting areas, bearing is zinc plated stamped steel, bearing is narrow inner ring, Standard seal is RST tight riding, full cover, metal shroud seals.