2 Kings 25:17
The height of the one pillar was eighteen cubits (27 ft.), and a capital of bronze was on top of it. The height of the capital was three cubits (4.5 ft.); a network (lattice work) and pomegranates around the capital were all of bronze. And the second pillar had the same as these, with a network.
1 Kings 7:15-22
He cast the two pillars of bronze; the one pillar was eighteen cubits high, and a [measuring] line of twelve cubits measured the circumference of both.
Jeremiah 52:21-23
Concerning 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.