– The 67mm-67mm 67-67 Female to Female Double Inner Thread Lens Coupling Ring Adapter is designed to connect two lenses together, providing increased versatility and functionality for your photography. – It is constructed from durable aluminum alloy, ensuring longevity and reliability. – The adapter features an extra-deep inner thread, allowing you to stack multiple filters or accessories without vignetting issues. – The non-glare matte black anodized finish minimizes reflections, providing sharp and clear images. – It is compatible with all lenses with a 67mm filter thread, making it a versatile addition to any photographer's gear.