Exodus 36:24 KJV

22One board had two tenons, equally distant one from another: thus did he make for all the boards of the tabernacle.

23And he made boards for the tabernacle; twenty boards for the south side southward:

24And forty sockets of silver he made under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.

25And for the other side of the tabernacle, which is toward the north corner, he made twenty boards,

26And their forty sockets of silver; two sockets under one board, and two sockets under another board.