Exodus 27:10
and its pillars shall be twenty, and their sockets twenty, of brass; the hooks of the pillars and their fillets shall be of silver.
Exodus 26:19-21
You shall make forty sockets of silver under the twenty boards; two sockets under one board for its two tenons, and two sockets under another board for its two tenons.
Exodus 36:38
and the five pillars of it with their hooks. He overlaid their capitals and their fillets with gold, and their five sockets were of brass.
Jeremiah 52:21
As for the pillars, the height of the one pillar was eighteen cubits; and a line of twelve cubits did compass it; and its thickness was four fingers: it was hollow.