ball bearing
Bearing
The mechanism of roller skating bearings.
1, dustproof cover: There are metal cover and rubber cover, play a dustproof and waterproof role.
2, bearing beads: there are steel beads and ceramic beads
3, cage: metal frame and nylon frame.
4, inner ring: inner diameter 8mm, bearing bead track groove in the middle of the outer surface.
5, outer diameter 22mm, bearing bead track groove in the middle of the inner surface.