לְעֻמַּת֙ הַמִּסְגֶּ֔רֶת תִּהְיֶ֖יןָ הַטַּבָּעֹ֑ת לְבָתִּ֣ים לְבַדִּ֔ים לָשֵׂ֖את אֶת־הַשֻּׁלְחָֽן׃
Close by the border shall the rings be, for places for the staves to bear the table.
Rashi on Exodus
לעמת המסגרת תהיין הטבעת OVER AGAINST THE RIM SHALL THE RINGS BE — inserted in the legs over against the extremities of the border.
Or HaChaim on Exodus
לבתים לבדים, as housings for the staves. Whereas I have explained in connection with the rings of the ark that Betzalel had to cast four rings and attach them firmly to the ark, whereas he would insert a second set of rings inside the first ones to support the staves, the Torah here alters its instructions. Here there was no need to make a second set of rings. The rings mentioned here were the ones into which the staves were inserted directly.
Rashbam on Exodus
לעומת המסגרת, these were attached at the underside of the table but not to the border (מסגרת).