Increased line twist in the main fishing line
can make it difficult to cast or retrieve and can even stress the line to the breaking point. Swivels provide an axis point that allows leaders or rigs to spin, yet keeps the main line still. This reduces the amount of twist. Swivels with snaps also make it easier to change out lures, leaders and other fishing rigs. Both snap
swivels and three-way swivels allow two separate lines to be connected to a mainline.