I bought it to install a light of 25 mm.
Although it can be used for the time being, anxiety (thin attachment part) remains on the material.
I hope it can be used for half a year, but I think that it seems that somehow it will break easily.
I purchased two identical items. One attached to the handle of the electric bicycle without any problems, and then trying to attach it to another electric bicycle the same way, the mounting base broke. Although I could pay attention to the fact that it may be damaged, I was able to attach one thing safely. I think there is a problem with the amount of resin plasticizer (involved in flexibility). Plasticizers are out of old inventory and flexibility is lost. I'd like to return this.
It cracked at the time of installation. Although it was possible to fix with screws and the attached rubber, we recommend that you buy just size without using larger lights as it will not be usable if the fixed part of the light breaks.
I am using it to install lights of commuting cars. It's been 6 months since installation, but no cracking has occurred. Because resin is vulnerable to ultraviolet rays, I think that if you use a bicycle cover life expectancy will be extended.