This is a pipe swivel for bottom fishing, such as for striped beakfish and longtooth grouper. It's designed to improve bite and reduce snagging with a sliding weight. The diameter is 4mm, and 100-lb nylon line can pass through smoothly. The price has been reduced to the limit, so further discounts are difficult. I also have other large fish rigs, inshore bottom fishing rigs, and live bait rigs for sale. If you purchase multiple items, I will discount the shipping cost, so please leave a comment.