The Zacuto Z-HG-ZW Zgrip Z-mount Zwivel is an articulating handgrip that allows you to change the angle between two 15mm rods. You are provided with a 4.5" rod and a Z-mount Zwivel in the package. The zwivel is compatible with any 15mm rod with the quick-release handgrip and employs a single lever that controls both the 15mm rods. You can change the angle between the 2 rods by loosening the single lever. Adjustments to achieve the desired angle are possible via the separation between the parts induced by the integrated spring.