Once only available for commercial use, these heavy-duty swivels provide tremendous strength and durability that can only be found at SPRO. They are a powerhouse for their size rating. There isn't another swivel out there that can match the size and strength of a SPRO Heavy Swivel. Whether you are after big Catfish, Mako Sharks, or a monster Tuna, Spro Heavy Swivels are up to the challenge.