Ocean Reef Extender KitExtender Kit The perfect addition to your Gdivers basic model IDM, or any other OCEAN REEF full face scuba masks from 2006 on (with nylon clamping band). Each Kit Includes: Frame : frames are an extra protection for your head, an aesthetic finishing to your mask, a customisation to better identify the diver and a wide surface to add anything you can think of. On the top there is a flat surface, perfect to add any GoPro like sport camera. New NACS, or