Deep groove ball bearing in all series Good quality and price Fast delivery and large stock Professional ... )2): Single-row, double-rows3): Normal ring series, Thin-wall(ring) series 4. Application: Gear box, Tranportation vehicles, Agricultrial machnery, Instruments, Constrction machinery ... ball bearing 6000,6200,6300,6400,6700,6800,6900,4200 series