Fishing swivels are small devices used in fishing to prevent the fishing line from twisting or tangling. They consist of two rings connected by a rotating joint, which allows the line to spin freely without twisting or knotting. The swivel is attached to the main fishing line and the other end is connected to the leader or fishing lure. Swivels are commonly made of metal, such as stainless steel or brass, and are available in various sizes and strengths to match the fishing tackle and target fish species. Fishing swivels are an important component in many types of fishing, including freshwater and saltwater angling, and are often used in conjunction with hooks, sinkers, and other fishing tackle.