The king had them cast in clay molds in the plain of the Jordan between Succoth and Zarethan.
We have here an account of the brass-work about the temple. There was no iron about the temple, though we find David preparing for the temple iron for things of iron, Ch1 29:2. What those things were we are not told, but some of the things of brass are here described and the rest mentioned. I.
Commenting on 1 Kings 7:13-47
And Solomon left all the vessels unweighed, because they were exceeding many,.... The vessels of brass before mentioned, being so large, at least some of them, and so numerous; the Targum is, he laid them up, or placed them; he brought them from whence they were cast, and put them in the sanctuary without weighing them: neither was the weight of the brass found out...
HIRAM'S WORKS. (1Ki. 7:13-51) Solomon sent and fetched Hiram out of Tyre--The Tyrians and other inhabitants on the Phœnician coast were the most renowned artists and workers in metal in the ancient world.
Commenting on 1 Kings 7:13-51