1 Kings 7:15–16 (ESV)

15 He cast two pillars of bronze. Eighteen cubits was the height of one pillar, and a line of twelve cubits measured its circumference. It was hollow, and its thickness was four fingers. The second pillar was the same.

The explanation of Hiram’s work begins with the casting of two bronze pillars. Each of the two was approximately 9 metres high and 5 metres in circumference. Both were hollow, with the thickness of the bronze being 7.5 centimetres. On top of the pillars were the capitals, and the capitals were each approximately 2.3 metres high.