Every now and then you're lucky!

But now to the data, which of course are not specified:

*) Lamp
The opening itself is 22mm, 22mm thus fit into lamps, but not detained. I have tested a Fenix ​​LD20 with 19mm and this is a disaster. My Fenix ​​TK15 contrast, d = 25mm and this is held by the holder where it belongs, a little more will certainly also, but I guess one of the best efficiency between 24mm and 28mm diameter flashlight.

*) Link
The handlebar can have an estimated diameter of 19mm minimum. Where I am sure: Up to a maximum diameter of 26,8mm, the holder can be attached.

It is still in the process a rubber, which can be mounted between extremely thin and handlebar holder.

I myself have a short length of pond liner that I have always lying around for crafting cut so I could reach the optimum handlebar diameters.

Furthermore, I still recommend a Unterlegschaube between bolt and bracket to place, so that one increases longevity. The enclosed screw is M5.

Conclusion: A top product for the price!

Addendum after 15 months usage:

I have now changed the bike and the bike handlebar is much thicker (d = 30mm). Because the solution is able to help with the screw NOT. What does help is a good cable tie (!). This I did by starting pulled up through the two holes in the direction of travel. Clarification: The flashlight is therefore in direct contact on the cable tie. I continue to use the Fenix ​​TK15. The bracket is easy to move, but holds good with slight play (I have to readjust every 2 hours times with my bike [No Suspension]).