The RAM-HOL-TAB17-189BU consists of a double 3.3" twist lock suction cup base with 1.5" dia. ball, double socket arm, round base adapter and Tab-Tite™ universal clamping cradle. The suction cup base is designed to have a strong hold on glass and non-porous plastic surfaces. The spring loaded Tab-Tite™ cradle makes it easy to load and unload your tablet, along with keeping it secure while on the go. Interchangeable cup ends are designed to optimize the functionality of your tablet, allowing access to audio jacks, usb, power, and other ports, your tablet can be used just as it was intended. For off-road environments and extreme use, we recommended the use of a tether to assist in retaining your device.The Tab-Tite™ cradle is compatible with any tablet that will fit the dimensions listed below. It is important to verify the dimensions of your tablet when determining the overall size.