Plain Linear Bearing CFPJ12 12mm JIS, Square Flanged Center, Double WideJIS Double Plain Linear Bearing, 12mm ID, square 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