John Gill Commentary 1 Kings 7:10

"And the foundation was of costly stones, even great stones, stones of ten cubits, and stones of eight cubits." — 1 Kings 7:10 (ASV)

And the foundation was of costly stones, even great stones ,
&c.] Of a great price, and very large:

stones of ten cubits, and stones of eight cubits
some of one measure, and some of another; not so many cubits square, but of solid measure; they were so many in length.