4 They made shoulder pieces for the ephod, which were attached to two of its corners, so it could be fastened.

Read Exodus 39:4 Using Other Translations

They made shoulderpieces for it, to couple it together: by the two edges was it coupled together.
They made for the ephod attaching shoulder pieces, joined to it at its two edges.
The ephod consisted of two pieces, front and back, joined at the shoulders with two shoulder-pieces.