Now concerning the pillars: the height of one pillar was eighteen cubits, a measuring line of twelve cubits could measure its circumference, and its thickness was four fingers; it was hollow.
Jeremiah 52:21
Surrounding context
52:20 The two pillars, one Sea, the twelve bronze bulls which were under it, and the carts, which King Solomon had made for the house of the LORD--the bronze of all these articles was beyond measure.
52:21 Now concerning the pillars: the height of one pillar was eighteen cubits, a measuring line of twelve cubits could measure its circumference, and its thickness was four fingers; it was hollow.
52:22 A capital of bronze was on it; and the height of one capital was five cubits, with a network and pomegranates all around the capital, all of bronze. The second pillar, with pomegranates was the same.