The RAM-B-138-TAB4-225BU consists of a 3″ x 3″ backer plate, double socket arm, round base adapter and Tab-Tite universal clamping cradle. 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. 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.