Deadbolt operates with a key on the exterior and a key on the interiorFor use on exterior doors with glass panes or gates where additional security is neededMaximum security deadbolt offers superior protection against attacks by crowbar, hammer, wrench, saw, lock pick, and kick-inLifetime Limited Mechanical & Finish WarrantyCoordinate with other Bright Chrome products The double cylinder deadbolt provides maximum security protection with style and design. From coastal to contemporary design, the reflective Bright Chrome finish adds beauty to any space. Schlage has built a legacy of providing the highest level of security to homes and businesses. Install a Schlage, and you install nearly a century of total dedication to security, quality, and innovation.