Deep groove ball bearing: 1.Material: chrome steel. 2.Noise Level Z1,Z2,Z3,Z4 3,GCR 15 GCR11 4.Certificate: TS16949. Deep groove ball bearingDeep groove ball bearing Application:The deep groove ball bearing can be used in many different places such as:Gearbox, instruments and meters, electric motor, electric appliance, internal combustion engines, transportation vehicles, agricultural machinery, ...