Aluminum construction features smooth double threaded interfaces that resist wear through repeated installations, protecting both phone ports and attached photography gear 17mm inner & 37mm outer thread seamlessly connection smartphone lenses to DSLR standard 37mm and accessories, eliminating light leaks while ensuring compatibility with phone lens Ideal for mobile photographers and content creators seeking professional macro/wide angled capabilities without carrying DSLR equipment Capturing expansive 120 degree landscapes using 37mm wide angled attachments or achieve 1 1 magnification for intricate textures by reverse mounting DSLR lenses in macro mode This lightweight camera lens adapter bridge smartphone versatility with 37mm filter thread standards, enabling creative flexibility across travel, product photography, and nature documentation