Use on doors requiring a high level of security, turn piece interior locking, exterior locking using a key. Recommended for exterior-facing doors. Kwikset's SmartKey Security technology protects against advanced break-in techniques and allows you to re-key your lock yourself in seconds. 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 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. Security, Durability and Finish are Grade 2 BHMA certified, designed to withstand everyday use and common forced entry break-in methods. Exterior Keyed Deadbolt, Interior Turn Piece, Adjustable Latch, 2 Keys, Screws, Strike Plate, SmartKey Tool, Installation Hardware, Install Guide. Our products are backed by a lifetime mechanical and finish warranty with great customer service, see Kwikset warranty for more details. Kwikset's door hardware is treated with Microban, this offers powerful product protection that is 99.9% cleaner than an unprotected surface.