Chinook Brass Insert 6mm x 9mm (fin dagger parts)

Chinook Brass Insert 6mm x 9mm

A Metric thread -brass  barrel nut replacement for fin bases.

Inner 6mm metric pitch thread x 9mm outer diameter (5/16") brass insert.  

This is the most common size - fin base replacement insert. Fits most modern Cavity style fins from True Ames (TA) and Maui Fin Co (MFC).