- Waterproof design prevents water and debris from entering the bearing, extending its service life. - Made from precision bearing components and metal materials, delivering stable operation and durability. - Features a square bore that tightly engages with the bicycle foot, improving stability and transmission efficiency. - Supplied with waterproof screws to enhance sealing between the center axle and the bicycle frame, effectively preventing water intrusion. Practical applications - All-weather daily use: protects bearings from rain, spray, and splashes for reliable performance. - Mountain biking and off-road riding in wet or muddy conditions: helps maintain stability and prolongs bearing life. - Bike maintenance and upgrades: compatible with center-axle assemblies requiring improved sealing between the axle and frame.