Exodus 36:21-25

Ten cubits was the length of each board, and one and a half cubits the width of each board.

There were two tenons for each board, fitted to one another; he did this to all the boards of the tabernacle.

So he made the boards for the tabernacle: twenty boards for the south side;

and he made forty bases of silver under the twenty boards; two bases under one board for its two tenons, and two bases under another board for its two tenons.

Then for the second side of the tabernacle, on the north side, he made twenty boards,