Two styles old and new
New has broached allen hole to install
Old is taler and has wrench flats on the outside
Allows you to screw your inline regulator or gas through grip vertically into the front block of your mini cocker. (There are other applications but this is what it was designed for.) We keep the male threaded post as thick-walled as possible for added strength. This item is only guaranteed to work with ST front blocks.