The Gorilla Plate Adapter centers the tripod holes on the bottom of the gorilla plate. The Gorilla Plate Adapter is used in conjunction with the Zacuto Gorilla Plate. The Gorilla Plate adapter is needed to center the lens and camera between the rods if you are using a Z-Finder Pro with another manufacturer's rod support system supporting follow focuses and matte boxes.
Note: A height adjustable matte box is needed if using a matte box with the Gorilla plate on another manufactures plate system unless their plate system is height adjustable like the Zacuto DSLR Baseplate.
The Gorilla Plate Adapter comes with a longer 1/4 20" screw that will replace the smaller 1/4 20" screw that comes with the Gorilla Plate. You will need to take your screw out and use the longer one provided with the adapter to attach your camera to the plate.