These kits consist of a zinc-coated U-bolt base, double socket arm and 1" diameter ball with custom GoPro® Hero adaptor. The mount is designed with a 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; which allows for almost infinite adjustment and perfect viewing angles. Included in this package is hardware that will accommodate rails from 0.50" to 1.25" in diameter. The base includes black cover caps to be placed over the exposed ends of the U-bolt. The included composite rail adaptor can narrow the rail to a minimum width of 0.50". The GoPro® Hero adaptor attaches directly to the under-side of the camera, replacing the factory mounting bracket.