[Upgrade Material]-- The Bicycle Mirror with high definition acrylic lens, PC shell and PA frame, shockproof and shatterproof, long service life, it's a must-have for cycling [HD 360 Adjustable Rotatable Handlebar]-- The universal spherical design of this Bike Handlebar Mirror allows you to rotate it 360 until you find your desired angle. [Convex Bike Mirror]-- High-definition convex Bike Mirror gives you a clearer and wider view, improve safety when riding a bike. [Universal Design]-- The Bike Mirror is suitable for most bicycles, mountain bikes, electric bicycles, folding bicycles, scooters, etc. with a handlebar inside diameter of 16 to 22 mm. [Easy to install]-- This Handlebar Rearview Mirror should be installed on the end of the handlebar with a hex key, remove the handlebar connector and insert the expansion screw into the handlebar hole.