2 Chronicles 3:15

And he fashioned the two pillars of bronze; eighteen cubits was the height of one pillar, and a line of twelve cubits measured the circumference of both.

Now the bronze pillars which were in the house of Yahweh, and the stands and the bronze sea which were in the house of Yahweh, the Chaldeans shattered and carried the bronze to Babylon.

As for the pillars, the height of each pillar was eighteen cubits, and it was twelve cubits in circumference and four fingers in thickness, and hollow.