Diamond Fishing Products Heavy Duty Wind-On Swivels stop line twist and work well with any line to leader connection. These compact swivels pass easily through most rod guides and allow you to fight your fish right to the boat. Once only available for commercial use, these tiny, heavy-duty swivels provide tremendous strength and durability. There isnt another swivel out there that can match the size and strength of this swivel. Whether youre after big mako sharks or a monster tuna or marlin Diamond Fishing Products, Wind-On Bullet Swivels are up to the challenge and result in cleaner releases and less fish lost at the boat.