Upgrade Material: The bicycle mirror features a high-definition acrylic lens, PC shell, and PA frame, making it shockproof, unbreakable, and durable for long-term use. HD 360 Adjustable Rotating Handlebar Mirror: The universal spherical design allows 360-degree rotation to adjust the mirror to your preferred angle. Convex Bicycle Mirror: The high-definition convex mirror provides a clearer and wider field of view, enhancing safety while cycling. Universal Design: Compatible with most bicycles, including mountain bikes, electric bikes, folding bikes, and scooters, with a handlebar inner diameter of 16 to 22 mm. Easy to Install: This handlebar mirror installs at the end of the handlebar using a hex key. Remove the handlebar end plug and insert the expansion screw into the handlebar opening.