National Hardware's 3-15/16" Double Bolt Snap is designed to use with rope, chain, strap, animal leashes and other home, farm, and recreational applications. Zinc die-cast body and chrome finish are resistant to rust and corrosion. Easily attaches with retractable bolt and pull down trigger. For quick repeated attachments in a wide variety of applications. Double bolt is for quick attachment at both ends. Light Duty Rating with 100 lbs. Safe Working Load, always follow safe working load (SWL) limits included on packaging. National Hardware's Lifespan Limited Lifetime Warranty.