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Japan Brand Reasonable Price Nachi Groove Ball Bearing 6004-2NSE 20*42*12 mm JRDB banner Deep groove ball bearing Types: 1 , single row deep groove ball bearings 2 , with a dust cover single row deep groove ball bearings 3 , with a dust cover , a ring of single row deep groove ball bearings 4, the stopper grooves and snap ring of single row deep groove ball bearing outer ring 5 , ball gap deep ...