The RAM Tough-Claw is the perfect mounting base for toolless installation and removal on round, square, and odd-shaped rails and bars. The small version of the RAM Tough-Claw can quickly be clamped on rails ranging from .625" to 1.14" in outer diameter and is ideal for mounting ont he yoke of an aircraft, handlebars of bicycles and motorcycles, or even on kayak rails and roll bars. This kit includes the popular spring-loaded RAM X-Grip phone holder, featuring an 'X' design that expands and contracts to provide a perfect fit for your device - even if its in a case. This large version of the RAM X-Grip fits phones ranging from 1.75" to 4.5" in width and keeps your device completely functional and accessible. For outdoor applications, the RAM X-Grip includes a device tether that is recommended for added security and peace of mind.