Schlage B60N622 Deadbolt, Keyed 1 Side, Matte Black Deadbolt operates with a key on the exterior and a thumb turn on the interior; for use on exterior doors that need additional security Unique Snap 'n' Stay design holds the deadbolt in place for easy installation Maximum security deadbolt is ANSI/BHMA Grade 1 and offers superior protection against attacks by crowbar, hammer, wrench, saw, lock pick, and kick-in Designed for standard door prep (fits existing pre-drilled holes) Universal latch adjusts to fit 2-3/8" or 2-3/4"