Designed to fit into the cylindrical bore wall of fork stems that measure 12mm to 38mm (.5” to 1.49”) in diameter, the RAM-B-176-A-UN7U consists of a fork stem base, short length double socket arm, and the popular spring-loaded RAM^® X-Grip^® phone holder. The RAM^® X-Grip^® 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, 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. 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, the RAM^® X-Grip^® includes a device tether that is recommended for added security and peace of mind.