This mirror is designed to be attached to the ends of the handlebars on a motorcycle. Bar end mirrors are popular among riders for their style and versatility.he "CNC" designation indicates that the mirror and its components have been precisely machined using computer-controlled equipment. This typically results in a high-quality, precisely crafted product.Dual Tone" might refer to the mirror's color scheme, suggesting it has two distinct color tones or finishes, which could be black and another color for a stylish appearance.The primary function of a bar end mirror is to provide the rider with rearview visibility. It allows the rider to see vehicles and objects behind them, enhancing safety during rides.