Clamp on 'brake' to help fix the floppy sun visor problem common in 2nd generation CR-Vs. This is not a 100% fix and will not stop the visor drooping a little but it will reduce it to an insignificant amount compared to how they normally flop down.
Slips over the end of the visor near the pivot rod and clamps onto the rod. You will need a 1.25mm allen key to tighten the clamping bolt (which will need to be done occasionally as it settles in).
The difference between left and right sides is simply the direction of the bolt to make it look a little neater when the visor is up.