Designed for use with the Heli-Safe Caterpillar They do not have a swivel joint, but have a ring that makes the connection to the Heli-Safe much cleaner. Once applied, the Heli Lead stays in place until a fish ejects it. They are very stable when watering due to their shape. They have a very durable camou finish and come in weights from 1.5 oz to 4 oz. ha