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koji kawakami | all galleries >> My Accessories >> Rings/Tubes > BORG helicoids
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BORG helicoids

Left 11~18mm, right 15~25mm (you can get 27~47mm one too)
They have the both end of male and female same M42 threads
with 1.6mm thick M42 thread ring included. See the next photo.
This one >

You can get those equivalents easily on eBay by much cheaply,
but M42 thread ring is not included though.

other sizes: small medium large original auto
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