this is a cable support for front derailleur. the inner diameter is 34.9mm.
it fits very well with my dartmoor wish, but it can fits with all 34.9 pipes.
you need 4 M3x40mm bolts and 4 M3 nuts.
if you print this post a pic. thanks

RepRap

hephestos

No

No

0.3 or 0.2

30