Heavy Swivels are high-quality, heavy duty swivels designed for anglers who battle the big ones. Swivels are extremely useful for preventing your line from getting tangled upon retrieval, but the resourceful angler will employ them in a number of different contexts, like when chunking for large saltwater gamefish or trolling a splasher. They're generally used when fishing for large saltwater gamefish, although they can be used in any situation that requires high pound strength.