Suit for Most Bicycle - Fits inside handlebar within 17mm ~ 21mm (please measure it before purchasing).The bicycle mirrorhandlebar is suitable for both the left and right sides.^ Bike Mirrors Rear View Handlebar - The universally bicycle mirrors adjustable bicycle rearview mirror can be adjusted 360 to the desired angle, the viewing angle is more comfortable and you can see things clearly behind you.^ Universal - Safe rearview mirror fit for MTB, Road bikes, E-bikes, Trekking bikes, flat bars and drop bars.^ Durable&Long Lasting - Made of high quality nylon resin, which is impact-resistant and Eco-friendly. The solid structure ensures that this mirror can be used for a long time. Even when riding downhill, this mirror will not shake or crack.^ Easy Installation - Fixing the bike mirror in the handlebar end, then using bracket is fastened with expansion screws, After installation, the mirror does not shake or break on downhill roads.