Exodus 27:10
And the twenty pillars of it, and their twenty sockets, shall be of bronze. The hooks of the pillars and their bands shall be of silver.
Exodus 26:19-21
And you shall make forty sockets of silver under the twenty boards-- two sockets under one board for its two pins, and two sockets under another board for its two pins.
Exodus 36:38
and the five pillars of it, and their hooks. And he overlaid their capitals and their fillets with gold, but their five sockets were of bronze.
Jeremiah 52:21
And the pillars, the height of one pillar was eighteen cubits. And a line of twelve cubits went around it, and the thickness of it was four fingers. It was hollow.