KOYO`7338`46338`bearings! KOYO 7338 bearing is a high,speed precision Angular Contact Ball Bearings! Its size is 190 , 400 , 78 mm! KOYO 7338 bearing is mainly used for high,speed rotating scenes with high load, high precision, high speed and low temperature! Vibration, should prevent moisture, dirt intrusion, regular maintenance can extend the !!!