וְעָשִׂ֕יתָ חֲמִשִּׁ֖ים קַרְסֵ֣י זָהָ֑ב וְחִבַּרְתָּ֨ אֶת־הַיְרִיעֹ֜ת אִשָּׁ֤ה אֶל־אֲחֹתָהּ֙ בַּקְּרָסִ֔ים וְהָיָ֥ה הַמִּשְׁכָּ֖ן אֶחָֽד׃ (פ)
Mache dann fünfzig Haken von Gold und füge die Teppiche aneinander durch die Haken, dass die Wohnung ein Ganzes sei.
Rashi on Exodus
קרסי זהב CATCHES OF GOLD — Fermels in old French They put one end of them into the loops on one section and the other end into the loops on the other section and they thus joined them (these sections) together by means of them.
Sforno on Exodus
והיה המשכן אחד. Even though the respective level of sanctity of the two parts of the structure was not uniform, what they had in common was that both reflected the fact that the will of their Creator had been carried out. It reminds us of Isaiah describing different groups of angels calling to each other in mutual encouragement to proclaim the Holiness of G’d (Isaiah 6,3).
Rashbam on Exodus
וחברת, by means of hooks and loops you will join these two sections containing 5 curtains each.