M65x1 focusing helicoid with 17-31mm extension range

Chinese focusing helicoid with M65x1 thread and 17-31mm extension range.

This helicoid is useful for lenses without a focus ring.

It can also be used as a macro extension.

You can buy it directly from China cheaper. But if you are going to purchase some M65x1 adapters from us, you can add this helicoid to the package to save on shipping and get everything together.