Exodus 28:22-25 gives further instruction on making and attaching these same chains to the breastplate.

Exodus 28:24 uses these two gold chains to attach the breastplate to the ephod's settings.

Exodus 28:25 shows the chains from here being fastened to the settings on the ephod's shoulder pieces — a direct continuation.

Exodus 39:15 describes the actual construction of the same twisted gold chains commanded here.

Exodus 39:17 records the fulfillment: putting the chains into the rings on the breastplate.

Exodus 39:18 completes the attachment by putting the chain ends onto the ephod's settings.