NEWYI M42-M42 Mount Lens Adjustable Focusing Helicoid 36-90Mm Macro Extension Adapter Tube Ring

Features Front mount M42 FemaleRear mount M42 MaleLength 36mm min to 90mm max it offers a total of 54mm movement distance for the lens focusingSuitable For M42 screw mount lens and cameraMaterial Aluminum alloy Package Included 1 x Focusing Helicoid Adapter