Chains - See Exodus 28:14.

And thou shall make upon the breastplate chains at the ends,.... One end of them to be put to the breastplate, and the other end to the ouches on the shoulder pieces of the ephod, by which the breastplate hung from thence: the Targum of Jonathan renders it, chains of a certain determined size, of length and thickness exactly alike; or terminable ones, as it may be rendered, not circular like a locket, or chain of gold worn about the neck, but that had ends to it: some interpret it chains, made like ropes, in the same manner as cables are, twisted together; and such it is certain they were, by what follows:
of wreathen work of pure gold; not of circles and ringlets of gold coupled together, but of golden wires twisted together, as ropes are.

To bind the choshen to the ephod there were to be two close, corded chains of pure gold, which are described here in precisely the same manner as in Exodus 28:14; so that Exodus 28:22 is to be regarded as a simple repetition of Exodus 28:14, not merely because these chains are only mentioned once in the account of the execution of the work (Exodus 39:15), but because, according to Exodus 28:25, these chains were to be fastened upon the rosettes notice in Exodus 28:14, exactly like those described in Exodus 28:13. These chains, which are called cords or strings at Exodus 28:24, were to be attached to two golden rings at the two (upper) ends of the choshen, and the two ends of the chains were to be put, i.e., bound firmly to the golden settings of the shoulder-pieces of the ephod (Exodus 28:13), upon the front of it (see at Exodus 26:9 and Exodus 25:37).