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By certification 
Describe:
Insert Ball Bearings are designed in almost the same way as deep groove ball bearings, but the outer ring of insert ball bearing is spherical. This design allows the bearings to be easily mounted in a housing block and be self-aligning.
Insert Ball Bearings are designed in almost the same way as deep groove ball bearings, but the outer ring of insert ball bearing is spherical. This design allows the bearings to be easily mounted in a housing block and be self-aligning.
