The installation is a breeze. The end is the handlebar tube (fits 16-25 mm inner diameter) pushed and spread over a screw, finished.
The mirror can be adjusted as desired over three axes and which I think is best, even collapse. The joints are tight, so that the mirror is not adjusted for bumpy ride.
Overall, I must say that the mirror is smaller than I thought, but due to its convex shape, it offers a wide field of view. Above, I have a few photos set, where you can the size and the field of view to estimate quite well. As I said, it is quite small, but you can at least see at a glance whether a behind someone drives.
I still consider the great price of twelve euros I can give five stars with a clear conscience.