וַֽיִּתְּנ֗וּ שְׁתֵּי֙ הָעֲבֹתֹ֣ת הַזָּהָ֔ב עַל־שְׁתֵּ֖י הַטַּבָּעֹ֑ת עַל־קְצ֖וֹת הַחֹֽשֶׁן׃
And they put the two wreathen chains of gold on the two rings at the ends of the breastplate.
Read midrashic interpretation of Exodus 39:17: and classical rabbinic exegesis.