It is not a mirror, it is plastic which helps you see who is behind you, that's all. Do not expect magnification, intense light absorption, anti-fog mechanism, etc., etc., etc. On large handlebars it just barely fits on the last clip, which hopefully will hold, but if it doesn't, you can use some glue to keep it in place, just as you can replace the mirror at a glass shop and stick on a proper one. Nevertheless, it is functional for a bicycle.