John Gill Commentary 1 Kings 7:28

"And the work of the bases was on this manner: they had panels; and there were panels between the ledges;" — 1 Kings 7:28 (ASV)

And the work of the bases was on this manner
The following was the form in which they were made:

they had borders ;
plates of brass all around them, which enclosed them:

and the borders were between the ledges ;
which were short staves or bars of brass, that stood upright all around, like the staves of a cart on each side, or the rails of a balcony, only in double rows; and between these were the borders or plates of brass.