Features [Compatibility & Good Fitness] Specially designed for M42 screw lens and M mount cameras, replacement for Leica M240, M240P, M262, M3, M2, M1, M4, M5, M6, MP, M7, M8, M9, M9-P, M Monochrom, M-E, M, M-P, M10, M-A, etc. [Extend Focal Length] Pictures shot through larger focal length is of higher quality, presenting a realer sense in art. [Manual Focus] Can greatly enhance your old lens, improving focusing efficiency and accuracy. [Sturdy Metal Construction] Made from premium metal with exquisite workmanship, fits well with camera, durable for use. [Red Dot for Easier Installation] With a red dot on the camera?as a mark, very convenient for installation. Specifications Brand: Andoer Model: M42-LM Color: Black Material: Metal Product Size: 6.3 * 6.3 * 2.4cm/ 2.4 * 2.4 * 0.9inch Product Weight: 74g/ 2.6oz Package Size: 7.5 * 7.5 * 3.3cm/ 2.9 * 2.9 * 1.2inch Package Weight: 83g/ 2.9oz Note: Only the adapter ring is included. Package List 1 * Adapter Ring