Exod.26.23

And two boards shalt thou make for the corners of the tabernacle in the two sides.

Exod.26.23

Both of the two corner frames need to be double in thickness from top to bottom and fit into a single ring

Exod.26.23

and make two frames for the corners at the far end.

Exod.26.23

And you shall also make two boards for the two back corners of the tabernacle.