The opening to each stand inside the crown at the top was one cubit deep, with a round opening like the design of a pedestal, a cubit and a half wide. And around its opening were engravings, but the panels of the stands were square, not round.

1 Kings 7:30
Each stand had four bronze wheels with bronze axles and a basin resting on four supports, with wreaths at each side.

1 Kings 7:32
There were four wheels under the panels, and the axles of the wheels were attached to the stand; each wheel was a cubit and a half in diameter.

And the mouth of it within the capital and above was a cubit: but the mouth thereof was round after the work of the base, a cubit and an half: and also on the mouth of it were engravings with their borders, foursquare, not round.