NET
21 Each of the pillars was about 27 feet high, about 18 feet in circumference, three inches thick, and hollow.
Darby
21 And as to the pillars: the height of one pillar was eighteen cubits, and a line of twelve cubits encompassed it; and the thickness thereof was four fingers: it was hollow.
KJV
21 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.