●Size: about 5cm in length and 2cm in diameter Durable: Made of durable and lightweight aluminum alloy material. Cycling Wheel Light Lamp Extension Holder ●Installation: You can place the light under the bike and free up the handlebar space ●Field of View: Mount the light in this way, it can illuminate a wider field of view and provide better vision ●Installation: Quick release nuts can be replaced with the front wheel quick release and can be used to correct the lights ●Safety: This is an adapter for mounting lights on the hub, when you mount the lights in this way, it can illuminate a wider field of view and provide better vision, ensuring safety when riding at night