Jeremiah 52:21
Each pillar was eighteen cubits tall and twelve cubits in circumference; each was hollow, four fingers thick.
Berean Standard Bible
And concerning the pillars, the height of one pillar was eighteen cubits; and a fillet of twelve cubits did compass it; and the thickness thereof was four fingers: it was hollow.
As for the pillars, the height of the one pillar was eighteen cubits; and a line of twelve cubits encircled it; and its thickness was four fingers. It was hollow.