The adapter is most suitable for all filter types with 52 mm diameter. It can be quickly mounted to the GoPro Hero 3+ / GoPro Hero 4and makes your Action Camera even more flexible. You can now simply use a neutral-density filter, UV-filter or polarization filter in combination with your GoPro for even higher quality shots. When diving the adapter can also be perfectly used in combination with a magenta or red filter. It is made of anodized aluminium and fits exactly to your GoPro Hero.