Can install on 17mm ball head and converted into 1/4 connector, used for driving recorders, sports cameras, panoramic cameras, mobile phone tablet holders and more The ball socket diameter is 17mm, and the screw is standard 1/4-20, with wide application Great solution for adding ball stand systems to cameras or small electronic devices Craft from quality plastic, this adapter is lightweight, easy to install and remove, convenient to use for long time Thick and durability butterfly shaped lock lid, easy to grip and tighten, less prone to breakage