Fillets

Heb. hashukum, plur., joinings (Ex 27:17; Ex 38:17, Ex 38:28), the rods by which the tops of the columns around the tabernacle court were joined together, and from which the curtains were suspended (Ex 27:10, Ex 27:11; Ex 36:38).

In Jer 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.

From Easton’s Bible Dictionary (1897), by Matthew George Easton.