The Honeywell Deadbolt Single Cylinder in Polished Brass is a specially designed pin and tumbler configuration that provides added protection against unauthorized "bump key" entry. Lock can be easily rekeyed by any locksmith. The deadbolt is keyed on one side. The lock has a Grade-3 Residential Security; tested by ANSI (American National Standards Institute) to meet standards for residential security. Adjustable latch fits 1-3/8" 1-3/4" thick doors and 2-3/8" 2-3/4" adjustable backset. Installs easily with a Phillips screwdriver when holes are predrilled into door. Includes an adjustable latch, mounting hardware, instructions, drilling template and two (2) large head entry keys. Backed by a limited lifetime warranty.