Model Number:0720017 Item Name:Handlebar rear mirror Material:PC and acrylic glass Visible distance:About 20m ~ 40m Fit handlebar diamete:About21mm-22mm Net Weight:About 16 g Feature 1:rotatable/Ultralight/EasyInstallation Feature 2:Acrylic glass mirror/visible distance 20-40 meters WEST BIKING Bicycle RearviewRoad Bike Handlebar Mirror 360 Degree Rotatable Bike Accessories Safety Cycling Handlebar Rear Mirror Note: There is a protective film on the mirror, which can be removed. Please Note This rear mirror is only suitable for Road Bike. Suit for Handlebars outer diameter:within 26mm Suit for Handlebars inner diameter: within 20mm Rear view mirror inner diameter : About 19mm Please pay attention to the thickness of the handlebar Strap, it will affect the match size Road Bike 360 Rotatable Handlebar Mirror PVC shell + Acrylic mirror Product Features 360 rotatable Ultralight Easy Installation Acrylic glass mirror , visible distance 20-40 meters Can be install bike handlebar Product Description Item Name: Handlebar rear mirror Material: PC and acrylic glass Visible distance: About 20m ~ 40m Net Weight : About 16 g Must need for every cyclist After rear mirror is optimized ,it can be installation on bike handlebar This mirror free open or closed . you can close this mirror when you not use it , so that can be protection rear mirror It has 360 rotatable function , the cyclist will see back 20-40m distance.Let you see your back detail problem, that protection your safety Installation ways : Notice : Make sure that your handlebar belt is twisted and evenly trimmed to avoid affecting the installation of the mirrors.