The end of a length of wire is threaded through one side of a swage, the wire is then looped around a thimble and the end of the wire is threaded back through the swage.

Swages are normally used in concert with Thimbles (the tear drop shaped thin strips of metal that go inside of the Terminating Loop) so that when it is secured, the force of the bearing point is evenly distributed along the length of the thimble and minimizes wear and stretch on the wire cable. The swage and thimble are then secured using a swaging / crimping tool.  The thimble forms the 'loop' that is normally fastened to the saddle, eye screw/bolt or a shackle already secured to the  posts or uprights that form the frame or area that will contain the wire.