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Lfr50/5-4-2RS (NPP) Lfr50/5-4 2RS Rb Corrosion-Resistant Stainless Steel Yoke Type Two Row Angular Contact Ball Bearing U Groove Track Roller 5mmx16mmx7mmx8mm. high precision. Long Service Life. Good sealing performance to block dust. easy to install. Heavy Duty. Low noise smooth running. low resistance.