This shed door lock hardware is commonly used for securing double doors on medium weight wood and ensuring that a door locked with the chain bolt will safely remain anchored in position. The chain bolt storage shed door locks are protected by Exterior Weatherguard Coating for long-lasting quality. Chain bolts are unlocked by pulling on the 2-foot chain that is attached to a strong hard-drawn wire spring which throws bolt automatically when chain is released. Package includes a surface and mortise strike for installation flexibility, all mounting hardware and Instructions for shed door lock installation and use. A power drill and screwdriver are needed for the user to complete installation. Each chain bolt is 6” long and includes a steel case with zinc plating and a die-cast zinc bolt and chain with ring. Bolt has a 3/4″ throw.