Meanhoo 2 PCS Adjustable Flexible Handlebar Rearview Back Mirror Mountain Road Bike Mountain Bicycle Mirror Black Material: ABS Plastic. Color:Black. Size:13.5cm/5.31". Handlebar Diameter:20-22.5mm. Type:Plane Mirror. Package Included: 1 pair bike mirror. Adjustable for full angle, Applicable for both left and Right, High-definition and wide viewing angles. Made of high quality and durable material ,Compact design and easy to install & Popular Functional and Fashion style When located on the lever, it's in the very best position for viewing to the rear; slight flick of your eyes allows for a quick view behind The bike rearview mirror attaches directly to your Shimano STI road-brake / shifter lever, allowing unrestricted use of the entire handlebar for your other accessories. This flat mirror provide a very clear view and is plenty big enough for a wide field of view, and not distorted which makes it's easy to view any distance behind you... similar to a car rearview mirror.