Swivels are small fishing tools that are used to connect the fishing line to the lure or bait. They allow the lure or bait to spin freely, which can help to attract fish. Swivels also help to prevent the line from twisting and tangling.
Swivels are typically made of metal or plastic. They come in a variety of sizes and shapes. The size and shape of the swivel will depend on the type of fishing that you are doing. For example, larger swivels are typically used for saltwater fishing, while smaller swivels are typically used for freshwater fishing.