1. Comes with screws, made of 304 steel, rust-proof, secure, and prevents stripping. 2. Magenta lens filter, for underwater photography beyond 5m, restores natural light, corrects for the partially green scene caused by algae, often used in green water conditions with more algae and better water quality. 3. Red lens filter, for underwater photography beyond 5m, restores the red absorbed by water in natural light, often used in deep blue water with fewer algae and good water conditions. 4. Yellow lens filter, for night snorkeling photography, adjusts the color of the spotlight area for excellent effect. 5. Close to the lens for more perfect imaging, will not fall off during intense extreme sports. 6. For outdoor extreme sports photography, can increase the enjoyment of photography. 7. Suitable for diving, cycling, swimming, skiing, skydiving, and other scenes.