Interior Pack (Single Cylinder) Function: Schlage single cylinder interior packs complete the interior mounting of a working mechanical lock set, and require an associated exterior single cylinder trim for installation. Product Features: A Lifetime Mechanical and Finish Warranty gives you the peace of mind that this product will be looking good and functioning smoothly for as long as you own it. (Finish warranty does not include Oil Rubbed Bronze because it is a living finish and it is expected to patina over time) Installation is easy, all you need is a screwdriver and a little time. The set is designed to fit standard prep doors and most installations should take just a matter of minutes. BHMA/ANSI Grade 2 certified which indicates excellent performance across a range of residential applications. This product is built from high-quality materials to give you exceptional security.