Exodus 36:26-30

and their forty bases of silver; two bases under one board, and two bases under another board.

And for the back of the tabernacle, to the west, he made six boards.

He made two boards for the corners of the tabernacle at the back.

They were double beneath, and together they were complete to its top, to the first ring; he did this with both of them for the two corners.

There were eight boards with their bases of silver, sixteen bases, two bases under every board.