Exode 26:37
And thou shalt make for the hanging five pillars of shittim wood, and overlay them with gold, and their hooks shall be of gold: and thou shalt cast five sockets of brass for them.
Exode 27:10
And the twenty pillars thereof and their twenty sockets shall be of brass; the hooks of the pillars and their fillets shall be of silver.
Exode 27:17
All the pillars round about the court shall be filleted with silver; their hooks shall be of silver, and their sockets of brass.