The RAP-274-1-UN7U consits of RAM® EZ-ON/OFF™ dual strap base 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. 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. Adjust the zip ties for attachment to a variety of rails, from a minimum of .5" in diameter. For outdoor applications – like being used as a bicycle phone mount – the RAM® X-Grip® includes a device tether that is recommended for added security and peace of mind.