Ideal for vehicle windshields, the RAM-B-166-UN10U consists of a 3.3" diameter RAM® Twist-Lock™ suction cup base, medium length double socket arm, and the popular spring-loaded RAM® X-Grip® large 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 powder-coated, marine-grade aluminum, stainless steel components, and high-strength composite, this large 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. 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.