The RAM-B-138-UN7 consists of a 2.5″ diameter round base with the universal AMPS hole pattern, double socket arm and universal spring loaded X-Grip® holder for cell phones. Designed into the mount is a 1″ diameter patented rubber ball and socket system with adjustment points at the both ends of the socket arm; this with a twist of the arm knob, allows you can move the mount to your optimum viewing position. The included X-Grip® cradle has a clean and clever four leg design that sports great holding power without hiding your phone behind foam pads and plastic. The spring loaded X-Grip® holder expands and contracts, allowing for a perfect custom fit of your cell phone. The perfect compliment to the modern sleek interior of today’s vehicles, the RAM X-Grip® is the cell phone holder evolved. Compatible Devices (WITH OR WITHOUT CASE): Apple iPhone 5s Apple iPhone 5c Apple iPhone 5 Apple iPhone 4S Apple iPhone 4 Apple iPhone 3GS Apple iPhone 3G Apple iPhone Apple iPod touch (All Models) Apple iPod (G1-G5) Samsung GALAXY S4 Samsung GALAXY S5 The X-Grip® holder is compatible with handheld devices that will fit the dimensions listed below. It is important to verify the dimensions of your handheld device with a case/sleeve/skin when determining the overall size. Holder Dimensions: Minimum Width = 1.875″ Maximum Width = 3.25″ Depth = 0.875″ Features: 1. Rustproof 2. High strength composite and stainless steel construction 3. Spring loaded holder expands and contracts for perfect fit of your device 4. Rubber coated tips will hold device firm and stable 5. Socket technology allows for multiple adjustment angles and articulation of device 6. Lifetime warranty 7. Made in U.S.A.Material: Powder Coated Marine Grade Aluminum, Marine Grade Stainless Steel Components & High Strength Composite Ball Size: 1″ Rubber Ball „B” Size Note: Part number reflects product packaged in clear clam shell for store shelf display.