Llewellyn Seat Tube Binder Boss in Mild Steel
- Investment cast M5 boss for Columbus External butted seat tubes.
- Designed to fit Columbus external butted seat with an external diameter of 32.7mm to 33.5mm. Used as a pair to give a secure but gentle grip to carbon seat posts.
- Easy to fir and braze: Drill 2 x 2mm location holes for the boss' location pin.
- There is a brazing rod feed hole for easy clean brazing. Uses M5 x 20mm long button head screws.
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