In Gbaya, the notion of something round is emphasized in the referenced verses with kirkiti, an ideophone that designates a round object.

In 2 Chronicles 3:5 it refers to the round stems of (artificial) palm trees around which chains were circled and in Zechariah 5:7 to a round lid that was lifted.

Ideophones are a class of sound symbolic words expressing human sensation that are used as literary devices in many African languages. (Source: Philip Noss)