1、High Speed Operation: Rotate with minimal frictional drag, so as to obtain high accuracy smooth motion. 2、Exquisite Workmanship: Advanced technology, smooth and flat bearing surface, waterproof and dustproof, not easy to rust, long service life. 3、High Quality Steel: The material has high hardness, good wear resistance and contact fatigue strength, while the core also maintains good toughness and can carry high impact loads. 4、Mute Effect: Working in coordination with the machine, greatly improving the operating efficiency of the machine, and bearing noise is smaller. 5、Wide Application: Widely used in gear box, instrumentation, motor, household appliance, internal combustion engine and so on. Item Type: Self Aligning Ball Bearing Material: High Carbon Chromium Bearing Steel Application: Widely used in gear box, instrumentation, motor, household appliance, internal combustion engine, transportation vehicle, agricultural machinery, construction machinery, engineering machinery, roller skate, yo yo, etc. Product Parameter and Specification: Model ID, OD and Thickness (Approx.) 1304 20mm / 0.79in, 52mm / 2.05in, 15mm / 0.59in 1305 25mm / 0.98in, 62mm / 2.44in, 17mm / 0.67in 1306 30mm / 1.18in, 72mm / 2.83in, 19mm / 0.75in 1307 35mm / 1.38in, 80mm / 3.15in, 21mm / 0.83in 1308 40mm / 1.57in, 90mm / 3.54in, 23mm / 0.91in 2 x Self Aligning Ball Bearing