National Hardware's 5/16", Black, Quick Link is designed for fast, easy connections between two lengths of chain or for attaching accessories to chain. Storm Shine Finish for style and high resistance to corrosion & abrasion. Safety supports a working load of 1760 lbs. Caution: Do not use for overhead lifting, support of human weight, athletic or playground equipment. For exterior applications. Made with steel for durability. National Hardware's Lifespan Limited Lifetime Warranty.