The U shape of this locking plug inserts between the legs of the click-in tangs portion of the camera mounted quick disconnect mount, after the camera mounted clip legs are inserted into the female receiving sticky back tape mount. It's more for high speed applications like auto racing, as it keeps vibration down so the camera doesn't rattle and this plug helps ensure the legs can't bend in and accidentally release the camera. Features 100% brand new and high quality. Compatible with: GoPro Hero 1 2 3 3+ 4 Color: White Material: Silicone Can be inserted in between the arm ends of the quick release buckle. Having the rubber plug inserted prevents any accidental release of the quick release buckle, and also tightens up the fit. The looped end of the plug can be attached to the thumbscrew to keep it secure when not locked into place. Camera, housing and other parts are NOT included. Package Includes: 2 x Lock plug for Gopro