The RAM-B-166-UN10 consists of a 3.25″ twist lock suction cup base, double socket arm and universal spring loaded X-Grip® IV holder for 5″ large phones and phablets. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. Designed into the mount is a 1″ diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob, allows you to move the mount to your optimum viewing position. The spring loaded X-Grip® IV holder expands and contracts, allowing for a perfect custom fit of your 5″ phone or phablet. Included are easy access grip knobs for quick insertion and release of your handheld device. Compatible Devices: HTC Droid DNA Huawei Ascend P1 LG Intuition Nokia Lumia 920 Pantech Vega No. 6 Samsung GALAXY Mega 5.8 Samsung GALAXY Mega 6.3 Samsung Galaxy Note Samsung Galaxy Note 2 Samsung Galaxy Note 3 The X-Grip® IV 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. X-Grip® IV Holder Dimensions: Minimum Width = 1.75″ Maximum Width = 4.5″ 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. Versatility of holder allows for attachment to many RAM ball mounts 6. Lifetime warranty 7. Made in U.S.A.Material: Powder Coated Marine Grade Aluminum, Marine Grade Stainless Steel Components & High Strength CompositeBall Size: 1″ Rubber Ball „B” Size Note:RAM Highly Recommends adding a secondary tethering device for all open cockpit applications while using this product. Part number reflects product packaged in clear clam shell for store shelf display.Related Links:X-Grip® Mounts.