【HD Convex Mirror】- 4pcs bicycle mirrors are made of acrylic convex mirror (Ø2.7in), which has a large field of view, stable image, safer riding, and a longer service life compared with traditional glass mirrors. Note: Please remove the protective film(not the label) before using. 【360° Full Rotation】- Fully adjustable 360° design bicycle rearview mirror can be installed on the end of the handlebar to get a perfect angle of view, helping you observe all directions of your back and ensuring safe riding. 【Durable Design】- The bicycle mirror has a high-impact nylon frame body and a flexible and durable aluminum fixture. The compact design makes it shockproof, and the folding design makes it avoid obstacles. 【Widely Compatible】- This bicycle mirror matches the handlebars with an inner diameter of 18mm/0.7in~22mm/0.86in, which is perfect for road bikes, mountain bikes, city bikes, electric bikes, etc. Note: Pls check if the mirror is suitable for your bike handlebar 【Easy to Install】- The package comes with two 4mm and 5mm allen wrenches. When installing, use the hex wrench to fix the screw to the bicycle handlebar, and then tighten it to ensure a firm closure. Warm Tips: Please remove the protective film before using Specifications: Item name: Bike mirror Material: Acrylic Mirror diameter: 2.7in The inner diameter of the matching handlebar: 18mm/0.7in~22mm/0.86in Package weight: 12.8oz Package list: 4 × Bike mirror 4 × 4mm allen wrench 4 × 5mm allen wrench