All of our head light mounts deliver rock solid mounting but for those that demand the most rigid set up, the NiteRider Lumina Handlebar Clamp Mount is here to deliver a high degree of performance and stability. Fits a max bar diameter of 35mm. SYSTEM COMPATIBILITY - Lumina Series - MiNewt Cordless Series - Mako Series WARRANTY - This NiteRider accessory is backed by NiteRider's lifetime warranty that covers any defects in mechanical components (housings, covers, mounts and fasteners)