Jeremiah 52:20-21

20The two pillars, the one [enormous] Sea (basin), and the twelve bronze bulls under the Sea, and the stands, which King Solomon had made for the house of the Lord—the bronze of all these things was beyond weighing.

21Concerning the pillars, the height of each pillar was eighteen cubits (twenty-seven feet), and a line [an ornamental molding] of twelve cubits (eighteen feet) went around its circumference; it was four fingers thick, and [the pillar was] hollow.