Dig deep into the corners of your tackle box or bag and you may just find a swivel. Swivels are pieces of terminal tackle that seem to end up strewn about the box or bag and often not paid much attention. However, swivels are a necessary part of many rigs that could not effectively be tied or fished without them. One of the more common and useful swivels is the double eye barrel swivel. When correctly rigged, the swivel allows an angler to present a variety of baits in a natural manner to attract fish.