68series Thin Ball Bearings can be used in automobile,precision machinery,electric ... Open1- 68series Thin Ball Bearings :68,69series with open,Z,ZZ,RS,2RS,NR available2.material:chrome steel3.quality certification:ISO9001:2000 ... .service:prompt delivery,OEM available7.Advantage:competitive prices with excellent quality High Quality 68series Thin Ball Bearings