... categorized as slim/thin section, double sealed, radial, deep groove ball bearings, 6804RS bearings are made of Chrome Steel with chrome ... bearing from dust or any possible contamination, 6804RS bearings are sealed and self lubricated, the 6804RS inner diameter is 20mm, ... 11,000 rpm, 6804RS bearings are lubricated with grease.Name: 6804RS ball bearingItem: Double Sealed Ball Bearings6804RS Size: 20mm x ...