A thread about a giant needle

[Cleave]

At a recent estate sale, I bought a couple triangle files, still in the sleeve they were bought in. I got home, pulled them out, and also in the sleeve was a giant needle. The business end is an equilateral triangle in cross section, about 3/16" edge length. The whole needle is almost 5" long.
I would hazard a guess this was either for heavy leather harness or saddle work, or perhaps cobbler work - but google images on both of those trades isn't showing anything similar. Any ideas?

 

[Shiftless]

Maybe for sail makers?
(just guessing)

 

[Cleave]

Yes! Looks like that's correct. I wonder how the triangle part was important, just getting a heavy thread through the fabric fibers and letting the thread slide through properly behind it?

 

[larry_g]

We call them sacking needles on the farm for sewing up burlap sacks.

Another thread with info, https://www.garagejournal.com/forum/threads/mystery-tool-lot.505909/#post-9829753

lg
no neat sig line

 

[Farmer J.]

Yea, it's a 'sacking needle', great for stitching coarse hessian sack materiel.
I have one similar but a but longer and curved, it's for stitching closed the huge bags for packing sheep's wool in to.