'Edges' in the Bible

It is to have two shoulder pieces joined to its two [back and front] ends, so that it may be joined together.

You shall make on the breastpiece two rings of gold, and shall put the two rings on the two ends of the breastpiece.

You shall put the two twisted cords of gold in the two rings which are on the ends of the breastpiece.

They made attaching shoulder pieces for the ephod; it was attached at its two [upper] edges.

Then they put the two twisted cords of gold in the two rings on the ends of the breastpiece.

Now Ehud made for himself a sword a cubit long, which had two edges, and he bound it on his right thigh under his robe.

The fee [for sharpening] was a pim (two-thirds of a shekel) for the plowshares, the picks, the pitchforks, and the axes, and to straighten the goads (cattle prods).