Set of Koken 2760 1/4" Drive Extension - 50mm 100mm 200mm - Socket Ratchet Japan
Only used a handful of times so in perfect condition, as can be seen from the pictures.
https://www.uktools.com/200mm-long-14drive-extension-bar.html
I have quite a bit of Koken kit listed.
Please check out my other similar items - I'm always happy to combine postage!