Exodus 27:10
it shall have twenty pillars and twenty bronze sockets; but the hooks of the pillars and their fasteners shall be silver;
Exodus 26:19-21
You shall make forty silver sockets under the twenty boards, two sockets under each board for its two dovetails, and two sockets under another board for its two dovetails;
Exodus 36:38
and [he made] the five support poles with their hooks, and overlaid their [ornamental] tops and connecting rings with gold; but their five sockets were bronze.
Jeremiah 52:21
Concerning the pillars, the height of each pillar was eighteen cubits (twenty-seven feet), and a line [an ornamental molding] of twelve cubits (eighteen feet) went around its circumference; it was four fingers thick, and [the pillar was] hollow.