The REVORING 52-72mm Variable Adapter for 72mm Filters from H&Y Filters is a unique adapter ring to attach a 72mm filter on to a variety of lenses quickly. It features unique self-retracting blade technology with threaded ends to secure on the front of any lens with a filter thread size of 52-72mm. Each threaded blade has been designed to overlap therefore completely removing any possibility of light leak. The well-designed retractable blades mount solidly on the lens. Each of the threaded blades has been designed to overlap, completely removing any possibility of light leak. No more adapter rings will be needed in order to be mounted on different lenses with a large circular filter.