Plain Linear Bearing CFPMR20 20mm ID - Round Flanged Center, Double WideDouble plain linear bearing, 20mm ID, round center flange, precision running clearance. This Simplicity bearing uses a self lubricating FrelonGOLD liner bonded directly to the bore of a sturdy aluminum body, without a separate bearing insert. The result is maintenance free, oil free sliding performance in extreme conditions such as heat, dirt, and vibration, where ball bearings often fail. The double size is equivalent to two standard sized bearings