This Weiser single-cylinder deadbolt can be locked or unlocked by a key on the outside, or the turn piece on the inside. It features a nickel-finish square rosette and is designed for use on exterior doors where keyed entry and security is needed. Featuring SmartKey re-key technology, re-key the lock yourself in seconds in 3 easy steps, so the key of your choice fits your new lock. Features an adjustable latch to fit all standard door preparations. Locking mechanism functions with turn piece on the interior of the lock. 1 in. deadbolt throw. Easily installs in minutes with just a screwdriver. Moreover, this product features Microban(R) antimicrobial technology, preventing microorganism growth on surfaces. ANSI/BHMA grade 3 certified. Lifetime mechanical and finish warranty.