The RAM-B-189-A-UN9U consists of a double 3.25" twist lock suction cup base, short double socket arm, round base adapter and universal X-Grip® cradle for 9"-11" tablets. The double suction cup base is designed to have an extra strong hold on glass and non-porous plastic surfaces. The X-Grip® cradle is compatible with 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.