Features: The bicycles rearview mirror can adjust 360 degree. It can adjust freely and is not easy to shake. Easy to install: The bicycles reflectors can directly installed on various bicycles handle without additional accessories. The lens adopts a convexes mirror, which provide a widers field of view and allows for long views. It can used for handlebars of 1.5-3.50cm/0.59-1.38inch, suitable for mountain bikes, road bikes, and even electric bikes. This flexible bicycles mirror, which easy to install, provide you with a wide view of everything behind you,great for day commuting. Specifications: Materials: Plastic Size: Large/Small Large diameter: about 8cm/3.15inch Small diameter: about 5.50cm/2.17inch Package Includes: 1PC Bicycles Rearview Mirror note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.