Long Reach Swivel Ball/Post Positioner. This is the Mount Post for Long Reach Universal Systems. By using a Double Ball and Socket Joint, the Upper Arm can be positioned at virtually any angle required.  The Lower Post is 5/8″ (1.59cm) Diameter and its height is adjustable from 2″ (5cm) to 16″ (41.9cm) tall.  Upper Arm is 1/2″ (1.27cm) Diameter and has 16.5″ (41.9cm) of reach.