Suction Cup Twist Lock Base Mount w/X-Grip IIPart #: RAM-B-166-UN8U Consists of the universal spring loaded X-Grip II? holder, socket system and 3.25" suction cup twist lock base. The suction cup base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. X-Grip II consists of a spring loaded holder and 1" rubber ball connected to the back of the base. Included are extra easy access grip knobs, located on the back of the holder for quick release of your tablet. It expands and contracts for perfect fit of most 7" tablets. Please verify dimensions of your tablet below for compatibility with the X-Grip II. Compatible Devices: Amazon Kindle Archos 7 Asus EEE Pad Memo Barnes & Noble NOOKcolor BlackBerry PlayBook Dell Streak 7 HTC Flyer Samsung Galaxy Tab (7" version) Holder Dimensions: Minimum Width = 2.25"(Devices 2.25" in width must be a minimum of 7" in height to fit) Maximum Width = 5.75"Depth = 0.875"Features: 1. Spring loaded holder expands and contracts for perfect fit of your tablet 2. Rubber coated tips will hold your tablet firm and stable 3. Versatility of holder allows for attachment to many RAM-to-RAM ball and 1" socket mounts 4. Socket technology allows for multiple adjustment angles and articulation of your tablet 5. Easy access grip knobs, located on the back of the holder for quick release of your tabletMaterial: High Strength Composite, Rubber Tips and Powder Coated Marine Grade Aluminum | RAM Mount Twist Lock Suction Cup Base w/ Universal X-Grip II