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.