GoPro Tie Down Ring Mount: Adjust your GoPro by rotating the aluminum adapter 360 degrees on a 1/4-20 threaded stud. Lock in place with the jamb nut using a 7/16" wrench. Quickly turn any standard tie down ring into a camera mount. The aluminum base uses a thumb screw with a hex drive head. The aluminum centering nut allows quick attachment to any tie down ring with up to a 1 inch diameter hole. The centering nut has a grooved outer edge allowing a perfect fit on most standard aircraft such as Cessna and Piper tie-down rings. It is recommended to use the GoPro safe metal case to eliminate the common problem of plastic cases and mounts breaking.