Top quality: mirrors are made with top-quality and durable materials. Extra strong reinforced brackets and one-piece molded frame making it durable and made to resist impacts. Convex clear view: outfitted with convex glass ensuring clear vision, high quality glass offering you a super clear view. Made with convex acrylic, the mirror is also very durable and ensures a clear vision of the scenes behind you. 360˚ rotation: the base allows a 360˚ rotation, so you can adjust the mirror with ease on every type of bicycle. Highly compatible: fits inside handlebar within 17.4mm ~ 22mm (inside diameter). Easy installation: place mirrors on both the left and right sides. Use a 5mm hex wrench to secure the screw to the bicycle handlebar, and then tighten it to ensure a secure closure. package contents 2 x bike mirror 2 x tool material: abs, glass colour: black product size: 14 x 7 x 7 cm package size: 21 x 12 x 3 cm