Feature:1. Flat Mirror: The bike helmet mirror uses a flat mirror, which can help you accurately judge the distance of objects behind you2. 360 Degree Adjustment: The bike helmet rear view mirror can be adjusted 360 degrees, allowing you to use your peripheral perspective to see exactly behind while maintaining a clear view of the road ahead3. Convenient and Practical: The axle length of the cycling helmet mirror keeps the mirror at the right distance in front of you for a stable ride4. Quick Attachment: The bike mirror uses nylon buckles for quick and easy attachment to the helmet without worrying about the mirror vibrating during the ride5. Simple Operation: Operation is simple and convenient, the bike mirror can be easily installed on the left and right without complicated processSpecification:Item Type: Bike Helmet MirrorMaterial: Aluminum Alloy, PlasticApplicable To: For M4000, for M590, for SLX, for XT and Other Hollow One Piece Cranksets Package List:1 x Bike Helmet Mirror