41 mm

EASY INSTALLATION: The Headlight is equipped with a mounting bracket that can be easily fixed to the handlebar.Both Headlight and Taillight can be easily loosen, and no tools are required. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.

EASY INSTALLATION: The Headlight is equipped with a mounting bracket that can be easily fixed to the handlebar.Both Headlight and Taillight can be easily loosen, and no tools are required. MUTIFUNCTION: This bike light set is suitable enough for cycling, hiking, camping, or any outdoor activity and can be used as flashlight.