ESP Quick Change Uni-LinksPerfect for the highly effective Ronnie Rig, the slight opening in the crook makes it easy to attach the hook and the smooth rotation provides 360-degree movement. These matt black Quick Change Uni-Links can also be used on a helicopter rig where the crook allows quick change of a looped hooklink and the large ring provides a safe set up.The two different sizes can be tailored to different sized hooks and baits to create a perfectly balanced presentation.