The cat's paw knot, also called an offshore swivel knot, is used to attach a swivel or ring to a double line with a complete loop (like the bimini twist knot). It is widely accepted as the best knot for this application and is an extremely strong and effective knot that resists slipping. It is usually tied in monofilament or fluorocarbon fishing lines and can be tied in many different line strengths. For general applications follow this guide: