Recommended range of use: It can be used for handlebars with a diameter of 22-25mm. It can be perfectly used for 22mm diameter handlebars. Can be used for mountain bike handlebar, leisure bike handlebar. 360 Degree Adjustable: Our bike rearview mirror can be adjusted to any angle according to your needs, no blind spots in the line of sight. Long Arm Coverage is Better: Environmentally friendly and safe long arm ensures better coverage of the field of vision, making your driving safer. Installation stability: high hardness aluminum alloy base, hard plastic bracket, the rearview mirror does not move when driving. The sturdy structure ensures that the mirror can be used for a long time. Even during downhill driving, the mirror does not shake, crack or break. Very easy to install: they have nuts to lock them in position so they don't move.Please adjust the mirror according to our suggestion, so you can have a wider view behind you while driving.