[Wide Angle] This guided jammer has a diameter of 6.8 cm. The high-resolution convex mirror has smooth surface, clearer vision, wider range and safer driving. 360-degree adjustable (&d): With 360-degree rotating design, this anti-theft switch can be adjusted at will. In addition, the glass rearview mirror can be installed on the left or right side, so that the driver can clearly see the vehicle behind him without turning his head. [Durable] Bicycle rearview mirror is made of durable nylon resin with impact resistance and corrosion resistance. The sturdy structure ensures that this miniature reflector can also be used for a long time. When unexpected bumps occur, it will not break easily. [Easy to install] 1. Connect the expansion screw to the inverter (do not tighten the screw yet) 2. Remove the rail connector and insert the expansion screw into the hole of rail 3. Turn the screw and tighten the bicycle rearview mirror. [Wide Application] This inverter is suitable for the left or right end of the guide rail. Suitable for 17.4 mm to 22 mm (inner diameter) guide rails, please measure before buying. Suitable for all kinds of bicycles, such as racing cars, Vtt, city bicycles, motorcycles, electric bicycles and so on.