If you're the cautious type who doesn't like to put all your eggs in a single basket, the RAM Dual Suction Cup Base delivers a desirable degree of rock-solid redundancy that will never let you down. In place of a single mounting base, this double unit boasts a pair of heavy-duty 3.3" D twist-lock suction cups that provide a twofold tenacious hold on glass, plastic, and similar smooth, non-porous surfaces. Opposite the adhesive bases are 4 pre-drilled mounting holes arranged in the universal AMPs (round) pattern. This industry-standard setup enables users to attach an extensive variety of RAM products and third-party offerings (sold separately) for an unlimited level of adaptability that can grow and evolve along with your operations. A fantastic item that's twice as nice at an excellent price!