KEYED DEADBOLT: Use on doors requiring a high level of security, turn piece interior locking, exterior locking using a key. Recommended for exterior-facing doors. SMARTKEY SECURITY: Kwikset's SmartKey Security technology protects against advanced break-in techniques and allows you to re-key your lock yourself in seconds. EASY INSTALL: Do it yourself, installs in minutes with just a screwdriver, all the hardware you need is included for a hassle-free installation, detailed directions provided. FITS STANDARD DOORS: Fits standard size doors 1-3/8" to 1-3/4" thick, adjustable latch backset from 2-3/8" to 2-3/4" with just a twist during installation. BOX INCLUDES: Exterior Keyed Deadbolt, Interior Turn Piece, Adjustable Latch, 2 Keys, Screws, Strike Plate, SmartKey Tool, Installation Hardware, Install Guide. CERTIFIED TRUSTED QUALITY: Security, Durability and Finish are Grade 1 BHMA certified, designed for the highest level of security and the toughest environments with frequent use.