We Chain Links Are Made Of 304 Stainless Steel, Waterproof, Rustproof And Corrosion-resistant, Anti-breakage, No Matter You Use It Outdoors Or Indoors, It Can Ensure The Sturdiness And Durability Of The Chain Links,Feature a threaded locking design with threaded ends and hex nuts for a secure connection. Simply rotate the screw to quickly establish a sturdy temporary or permanent link, offering ease of use and versatility for diverse needs, Applications for Hammock, Swing Chair, Yoga , Boxing Bags, Camping and Outdoor Equipment Other Heavy-duty Applications