Perfect for use on entry doors with glass needing an additional layer of security, a key is required to lock/unlock this double cylinder deadbolt from both the exterior and interior. This deadbolt is backed by over a century of dedication to durability, strength and craftsmanship from Schlage. Built with premium materials and certified to the highest industry standards, you can have peace-of-mind that this double cylinder deadbolt helps protect what matters most. Trust your home to Schlage.