The RAM-B-189-TAB17-ALA1-KRU consists of a double 3.3" twist lock suction cup base, double socket arm, round base adapter, extended retention knob and Tab-Tite™ universal clamping cradle. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces. The included backplate is interchangeable with various size support cups, making it compatible with numerous tablet models. New detachable support cups are the only components needed for purchase, attach to the backplate for support of your new tablet. 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.