Easton's Bible Dictionary
In Jeremiah 52:21 the rendering of a different word, Hut , meaning a "thread," and designating a measuring-line of 12 cubits in length for the circumference of the copper pillars of Solomon's temple.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Fillets'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/f/fillets.html. 1897.