Reverse M52x0.75 to M52x1 thread adapter for helicoids

• Front side - M52x0.75 male thread
• Rear side - M52x1 male thread

Made of high quality aluminium alloyWhy aluminium?.

This adapter allows using lenses with M52x0.75 filter thread reversed on M52x1 Chinese focusing helicoids.

It can be used for other purposes as long as items to be coupled have such threads (one has M52x0.75 female thread, other - M52x1 female thread).