Specifications:Made of aluminum & copper (not plastic)The lens adapter allows you to mount aPK mount lens to a for Leica M L/M Mount Camera.Besides for making financial sense, this allows you to use your favorite lens across different camera platforms, the lens adapter is designed to fit securely to the lens, yet can still be removed easily when not needed.With this adaptor ring you can use Contarex mount lens Mount lenses to fit on for Leica M system cameras (MP, M9, M8, M7, M6, M5, etc.).With this adapter, you can connect with latest TECHART LM-EA7 auto focus lens adapterIt can install in between camera body and lens without any tools. No replace or exchange original parts from lens nor camera body.Adapter Using ultra precision CNC machine tools, sophisticated material, high intensity, good operation stabilityFunctionFocusing infinity .No ROM connection on the adapter.Diaphragm control of the lens is set manually.Possible to use with Macro rings and other accessoriesIt does NOT require any complicated work.Note: