Over 1000 screen saver and wallpaper photos. The chain rivet presses into both outer plates, but the rivet slides freely through the inner plates and the roller.
Chains have a small amount of play at each link, even when brand new.
As a chain is ridden, it wears the rivets, and the play at each link increases. The chain is then removed, cleaned, dried, lubricated, and re-installed to the bike.