Plain Linear Bearing CFPJR30 30mm JIS, Round Flanged Center, Double WideJIS Double Plain Linear Bearing, 30mm ID, round center flange, precision running clearance. This Simplicity bearing has a self lubricating FrelonGOLD liner bonded directly to the bore of a sturdy anodized aluminum body, with no separate insert, for maintenance free, oil free sliding in harsh environments such as extreme heat, dirt, welding splatter, and vibration, where ball bearings often fail. Its double sized body equals two standard bearings back