National Hardware's 1/2" Quick Link provides a fast, secure connection between chain and chain accessories. Steel body construction provides maximum durability. Installs quickly using a hex shaped bolt that easily opens and closes with an adjustable wrench. Quick Links are designed to make permanent and temporary connections. Quick Links should be used with chain or other items with equal or lower working load limits. Heavy Duty Rating with 3,300 lbs. Safe Working Load, always follow safe working load (SWL) limits included on packaging. National Hardware's Lifespan Limited Lifetime Warranty