With the light extension holder, you can easy to install riding lights, ensure the safety of riding at night Install the light below the bike, can liberating the handlebar space. Installed in the rear wheel can replace the quick release nut, can protect the rear derailleur. Features - Color: Black. - Material: Aluminium alloy. - Size: 6.6 x 2.7 x 6.6 cm. - With the light extension holder, you can easy to install riding lights, ensure the safety of riding at night. - Install the light below the bike, can liberating the handlebar space. - This way to mount the light, can offer you a better vision, lighting a wider place. - Avoid to shining the people who are below the head of the bike directly, such as children, will not hurt the children's eyes. - Installed in the front wheel quick release can replace the quick release nut, can be used to fix the lights.