Spring-loaded 'X' design with rubber caps sports great holding power without hiding your phone; includes optional device tether for peace of mind during rugged use Includes motorcycle fork stem base that works with stems 12mm to 38mm in length and short length, B size RAM double socket arm; ball and socket technology allows for near-infinite adjustability Phone Holder Dimesions: Width Range: 1.875" - 3.25", Depth Range: .875" max; Please see installation instructions linked below under "Product guides and documents" Backed by a lifetime warranty