1.PROFESSIONAL DESIGN: Designed for cycling, easy to see the visor.rror can be rotated 360 degrees, flexible and convenient.^2.GENERAL DESIGN: There are light reflecting strips on the back of therror that make the bike safer.bicycle rear viewrror handlebar ^3. EASY INSTALLATION: Plug and play, which is easy to install and use. For most handlebars, mountain bikes and racing bikes.^4.Size of the mounting clamp: for 21-23 mm cross tube diameter. Bicycle handlebarrror without distortion. Razor-sharp, anti-reflective, impact-resistant and glare-free real glass^5.QUALITY MATERIAL: bicyclerror Made of high quality stainless steel and nylon resin, it is shockproof and corrosion resistant, ideal for all weather conditions.^