Adjustable Bike mirror: The Handlebar Bike mirror is very easy to adjust to get the best viewing angle with 360 degree rotatable and 180 degree adjustable. The diameter of the lens is 68mm，which providing wide-angle make riding so much safer and enjoyable HD Acrylic Lens: The bicycle mirror lens is made of premium Acrylic convex glass,which produces a distortion free image. When a vehicle or other moving object is in the far distance, you can easily determine its presence. As it gets closer the quality and clarity of the image continues to improve and detail about the object is clearly notable Stay Sturdily: The ball joints on the mirror are tight enough to hold in place, but not so tight as to make adjustments impossible. Once adjusted, the mirror doesn't budge,so that the rear view mirror does not wobble or shake even when riding over bumpy dirt ground Universal fit:This is a great bicycle mirror for drop bars or flat bars,fits bars diameter 17.4mm-22mm（0.68”-0.87”）,fits for MTB,road bike,folding bike etc. Compared to the third-eye helmet mounted ,it is a huge improvement. Just a quick snap glance gives you the road information you need Easy to install:The install tools are included. Insert the mirror into the bar end,tight the screw. Adjust the angle,tight the smaller screw.Remove the protective film then you will enjoy your riding now. We provide 365 days satisfaction guaranteed,if you encounter any issues,feel free to contact us