Reference

Exodus 36:21

The length of a board was ten cubits, and the breadth of a board one cubit and a half.
19

And he made a covering for the tent of rams’ skins dyed red, and a covering of badgers’ skins above that.

20

And he made boards for the tabernacle of shittim wood, standing up.

21

The length of a board was ten cubits, and the breadth of a board one cubit and a half.

22

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

23

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