This is an adapter that goes onto the dovetail of the Alexa EVF so you can mount it to an Magic arm or Israeli arm.
If you are shooting in confined space and need the EVF located in a weird way. This adapter allows you to mount the EVF to a Israeli arm for the support.
The adapter has the female dovetail and three 3/8-16 holes for placement. Comes with two 3/8-16 – 1/4-20 thread inserts that can be removed.