Zacuto's Gorilla Plate Adapter centers the Gorilla Plate's offset tripod holes by screwing into the bottom of the plate and providing a set of aligned holes. This is necessary when the Gorilla Plate and Z-Finder are mounted to another manufacturer's baseplate. Without the adapter, the camera won't be centered and the lens will not line up with a matte box or follow focus.
Note! A height adjustable matte box is needed if using a matte box with the Gorilla plate on another manufacturer's plate system unless, like the Zacuto DSLR Baseplate, their plate system is height adjustable.