JMT OEM Sports J-hook Buckle Vertical Surface Mount Adapter for Gopro Suptig Hd Hero 2 3 Chest Strap Belt Sports J Hook Buckle Flat Surface Mount Adapter For GoPro HD Hero 2 3 Chest Strap Belt J Hook Buckle Fit for Gopro HD Hero/Hero2/Hero3 This item is used with the camera mount, like as helmet and chest straps. Curved or Flat Adesive Mount.(Please leave us massage)