This is the NiteRider universal handlebar mount that fits up to 32mm. This mount works with any NiteRider brand light that uses the slider mounting clip and allows fully articulated positioning of the light on your handlebar. Specifications: Fits 25.4-31.8mm handlebars Pro Series HID Series Classic Plus & Seclect Evolution & Digital Evolution HeadTrip & Digital HeadTrip TrailRat & TrailRat Select RoadRat Digital Patrol LED Digital Patrol Pre 2001 systems