The Zgrip Z-Mount Zwivel is an articulating handgrip that comes with a black 4.5 inch rod and a Z-Mount Zwivel. It easily mounts to any 15mm rod with the quick-release handgrip. The Zwivel allows you to change the angle between the two 15mm rods. The Zwivel has one lever which controls the both 15mm holes. In order to change the angle of the rods, just loosen the single lever and the internal spring separates the parts for you to adjust to the desired angle.