en_tn_lite_do_not_use/exo/26/29.md

General Information:

Yahweh continues to tell Moses how the tabernacle must be constructed.

for them to serve as holders for the crossbars

"which will hold the crossbars" or "because they will hold the crossbars"

crossbars

These are horizontal support beams that give stability to the structure. See how you translated this in Exodus 26:26.