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™ includes a B size 1" rubber ball and can quickly be clamped on rails ranging from 1.87" to 3.25" in outer diameter – ideal for mounting mounting on the yoke of an aircraft, handlebars of bicycles and motorcycles, or even on kayak rails and roll bars. This kit includes a medium length double socket arm and 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 it's in a case. The standard size 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.