Usage Tips:Set yourself at any angle you want, the 360 degree rotating rear view mirror gives you the freedom to adjust it up and down or to the side. To get the best viewing angle in different road conditions - a perfect full view of everything around you so you can drive with peace of mind. The bicycle mirrors for handlebars with a diameter of 22-25 mm (8.66-9.4 inches). It can be installed on most handlebars of bicycles, such as mountain bikes, e-bikes, electric bicycles, motorcycles, electric scooters, etc. Make sure the screws go through the base in the right direction. Measure the diameter of your handlebar, 22-25mm The bicycle rearview mirror is made of high hardness aluminum alloy and hard plastic as the support, which is durable, strong but also lightweight for stability, quality and comfort. It is a weatherproof bicycle mirror. They have nuts to hold them in place so they don't move. Our bike mirror handlebar rearview mirror brings you clear and safer riding with bike mirror lenses, providing a wide high-definition field of view to see vehicles and obstacles easily and clearly, and see the cars coming from behind.