These clevises allow you to quickly change blades and sinkers without re-rigging. Simply snap them in and out effortlessly. The plastic system does not cut the line and the design makes changing blades or weights quick and easy. Great for troll spinners on monofilament or nylon covered 7 strand wire, and can be used on wire for casting spinners. Mini Troll and Troll models are White, Casting model is Black.