וּשְׁתֵּ֤י שַׁרְשְׁרֹת֙ זָהָ֣ב טָה֔וֹר מִגְבָּלֹ֛ת תַּעֲשֶׂ֥ה אֹתָ֖ם מַעֲשֵׂ֣ה עֲבֹ֑ת וְנָתַתָּ֛ה אֶת־שַׁרְשְׁרֹ֥ת הָעֲבֹתֹ֖ת עַל־הַֽמִּשְׁבְּצֹֽת׃ (ס)
and two chains of pure gold; of plaited thread shalt thou make them, of wreathen work; and thou shalt put the wreathen chains on the settings.
Rashi on Exodus
שרשרת זהב means CHAINS OF GOLD — the word being the same as שלשלאות (the letters ל and ר being interchangeable, as in ארמנות for אלמנות; cf. the Aramaic ארמלתא)
Sforno on Exodus
מגבלות, constructed to precisely defined dimensions, so that they will be stretched tight from the edge of the shoulder pads to the upper edge of the breastplate.
Rashbam on Exodus
מעשה עבות, seeing that normally, when we hear about “chains,” we think of rings inserted within the other in a continuous row, the Torah was at pains to describe these “chains” as being more like strands of ropes intertwined.