The Zacuto Z-C3GR C100/300/500 Grip Handle Relocator attaches to a separately sold Zacuto Zgrip to achieve distance-extended, chest-level handling of a Canon C300 Grip (which is a button-equipped hand controller that comes with the C100/300/500). The separately sold Zgrip is an upside-down V, with each side of the V a 15 mm rod. The V connects to the front of a full Zacuto rig to serve as handle-bars for the rig and the Relocator connects to one end of the V to serve as a handle (and as a base for the C100/300/500 Grip).
The C100/300/500 Grip, the C100/300/500-provided Controller, attaches onto the side of the Relocator and a 24" cable that's already built into the Relocator snakes up a rod of the V to connect to the C100/300/500. The Relocator thus provides two purposes: it allows the C100/300/500 Grip to be used on a Zgrip and allows it to be used from 24" farther than usual. (The C100/300/500 Grip's native cable connects into the Relocator). Since the rods of the V are long enough to reach chest level (as opposed to shoulder level), you'll be able to use the Relocator and thus the C100/300/500 Grip at chest level. The Relocator is fully articulating until locked in by lever.