What it is
The Hareline Stonfo Thin Tubed Bobbin Threader is a bobbin-threading tool made around a thin, flexible wire. It has a soft-touch handle and a hex-shaped end that keeps it from rolling off the bench.
What to tie with it
You use it to thread fine tubed bobbins, especially narrow-diameter bobbin tubes that can be fussy with small-diameter thread. Feed the thread into the wire loop and pull it back through the tube, which is handy when you’re changing spools often or working with very fine thread.
Flies and the fish they're for
This doesn’t go into the fly; it’s a bench tool that helps you keep tying momentum on any pattern that calls for small-diameter thread in a narrow-tube bobbin. That includes everything from small trout dries and nymphs to bass and saltwater streamers where you still want a fine thread for clean heads, neat tie-ins, and tight work around eyes and dumbbell weights.
How it compares
Omit this section entirely rather than inventing a comparison.