Albert Barnes Commentary 1 Kings 7:26

"And it was a handbreadth thick: and the brim thereof was wrought like the brim of a cup, like the flower of a lily: it held two thousand baths." — 1 Kings 7:26 (ASV)

The palm or hand-breadth seems to have a little exceeded three inches.

With flowers of lilies—Rather, “in the shape of a lily flower.” The rim was slightly curved outward, like the rim of an ordinary drinking-cup or the edge of a lily blossom. (See 2 Chronicles 4:5, margin.)