NiteRider: The new Go Big On-Centre Mount by K-Edge, the next generation in industry leading GoPro style interface Light Mounts /Camera. The new mount provides easier installation with a stronger more secure platform for your Lumina Series Head Light or action camera. Fits 31.8″ diameter size bars. On-Centre giving you a clean centred position for your Lumina Series light. And better framed image with the newer style cameras that have lenses centred on the camera, such as the GoPro Session and Garmin VIRB.• CNC Machined 6061 T6 Aluminium• Made in Boise, Idaho, USA• Lifetime Guarantee against material or manufacture defects.SYSTEM COMPATIBILITYFits 31.8mm bars; all mounting hardware included; works with all Lumina Series lights equipped with K-Edge GoPro Adapter (sku NR4000, sold separately), GoPro HERO Original, HERO2, HERO3, and GoPro Session Cameras. Shimano CM-1000, Garmin VIRB, and Garmin VIRB X.