These are little 1 foot extensions that bolt into the STI shifters. Shimano supplies them to the OEM's for bleedless installation by the assemblers, you can't but these separate though. Most people would get rid of these and route cables straight to the calipers, but I have a weird application where I need two sets of these. So far I have three pieces, I'm hoping to find someone with at least one in their parts bin.

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