Can be inserted in between the arm ends of the quick release buckle; Specially designed for some high speed activities like auto racing, as it can keep vibration down so that the camera will not rattle • 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. • Compatible with GoPro Hero 1, Hero 2, Hero 3, Hero 3 and Hero 4 cameras • Package included: Rubber Locking Plug x 5 pcs •  (quick release buckle and screw are NOT included)