The RAM^(R) 2.5" round plate base with 1" ball, standard arm and diamond base is ideal for mounting GPS cradles. Made of high-strength composite materials and utilizing the RAM^(R) double ball and socket system, secure your GPS or other device in the most rugged environments. The 1" diameter rubber ball and socket system features adjustment points at both ends of the socket arm for easy adjustments to achieve an ideal viewing angle. Ball 1"