This is the Sealife 52-67mm Step-Up Ring for 52mm Thread Adapter Features: Push-on design for easy to use attachment Compatible with other wet lenses and filters with a 67mm thread for universal use Requires SeaLife 52mm Adapter (sold separately) Constructed of black anodized aluminum in a durable construction Expand the photographic adaptability of your DC-Series Camera. Enable the use of 67mm lenses and filters by simply screwing in the SeaLife 52-67mm Step-Up Ring into your SeaLife 52mm Thread Adapter. This Step-Up Ring is durable and constructed to keep up with even the most challenging dive conditions.