The adjustable X-Grip Phone Mount from RAM MOUNTS allows you to clamp 1.9 - 3.25' wide smartphones to bike handlebars and other round, square, or odd-shaped rails and bars. The clamping range is 1 - 1.6' in diameter or thickness. The X-Grip easily clamps on with the turn of a single knob. It features a spring-loaded 'X' design with rubber caps that safely grip your phone. Additionally, a tether is included that you can choose to use for extra protection in rugged conditions.