This adapter is a smart solution that fits standard 'arca style' quick release plates on standard Gitzo quick release adapters. It works on a simple principle. It has to be inserted into a Gitzo profile C quick release adapter (please refer to the enclosed compatibility chart) & it safely locks into position, thanks to the Gitzo safety system. Now your head is ready to accept a standard 'arca style', quick release plate. In order to lock the 'arca style' plate into position, just use the stand