The Adaption Plate is a aluminium top cheese plate, that lets you switch between the Arri Alexa/XT handle and the Gravity One.
With three screws you mount the Alexa handle and the G-1 on or off.
Arri adaption plate
4 x M4 stainless steel screws
Made to adapt directly on Alexa/Alexa XT.
Multiple mounting threads for accessories
70 threads 1/4-20
20 threads 3/8-16