ANSI (American National Standards Institute) security deadbolt which meets the highest industry standards. Biggest bolt diameter for maximum kick-in-resistance. Exterior one-piece construction with anti-pick/pry shield helps protect against crowbar attacks. Unique snap and stay deadbolt design for a hassle-free installation. Keyed alike in multiples of 4. Order full case and receive 4 keyed alike. Limited lifetime mechanical and finish warranty.