The 1/4? to ARRI Accessory Mount Adaptor provides a solid, anti-twist mounting point on camera cages, monitors and other accessories that dont provide one.
The adaptor mounts via two 1/4? screws which have adjustable spacing to securely lock into place.
The ARRI Accessory mount standard is widely used and provides a 3/8? thread with anti-lock pin holes to prevent the accessory from coming loose.