The popular spring-loaded RAM X-Grip phone holder features an 'X' design that expands and contracts to provide a perfect fit for your device � even if it's in a case. Made of high-strength composite and stainless steel, the RAM X-Grip phone holder is compatible with a wide variety of RAM double socket arms and mounting bases. This version of the RAM X-Grip fits phones ranging from 1.87" to 3.25" in width and keeps your device completely functional and accessible. No matter what double socket arm and mounting base you pair the RAM X-Grip with, RAM ball and socket technology allows for near-infinite adjustability to achieve the ideal viewing angle � while also extending the life of your phone by providing shock and vibration damping. For outdoor applications � like being used as a motorcycle phone mount � the RAM X-Grip includes a device tether that is recommended for added security and peace of mind.