SODIAL(R) Aluminium Fishbone Wrench Nut Screw Spanner Tighten Tool for GoPro Hero 4/3+/3/2/1 Light weighted and portable. It will help you to secure your camera a lot tighter than trying to tighten it by hand. Works especially well when trying to install the camera with multiple extensions and more force needed tightening the knobs. Works for GoPro Hero 4/3+/3/2/1 mounting knobs and Hero Gear knobs.