Kommentar zu Schemot 27:17

כל עמודי החצר סביב וגו׳ ALL THE COLUMNS ROUND ABOUT THE ENCLOSURE etc. — Because Scripture expressly mentioned hooks and fillets and copper sockets in connection only with the north and the south, and with regard to the east and the west there is no mention of hooks and fillets and copper sockets (cf. vv. 14, 15, where there is indeed mention of sockets but it is not stated that they should be of copper), therefore Scripture now comes and gives directions that the sockets of all the pillars that are round about should be of copper.

כל עמודי החצר סביב מחושקים כסף, “all the pillars of the courtyard were to be banded with silver. Seeing that these pillars had not been plated with silver as the pillars inside the Tabernacle, they had to be fitted with silver bands (as around wooden caskets for beer or whisky) so that their wood would not crack during sandstorms.