SKF Personal Engine Bearings

Improved performance with low friction and patented locking structure

Adopts a high-performance rotating ball to minimize power loss
Unique locking structure tightens evenly, so eccentricity is less likely to occur.
Easy to replace and install units, reducing work time
Screws do not hit, reducing damage to the axle shaft
Easy to disassemble and maintain

For more details, please go through the below link
SKF Personal Engine Bearings