Keyed Entry (Single Cylinder) Function: Schlage single cylinder keyed entry door knob sets can be locked and unlocked from the exterior with a key, and then locked or unlocked from the inside with an associated turn-button. While primarily used to secure entrances and side doors, it can be used anywhere a little extra security is desired. 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. Specifications: Backset: Adjustable to 2-3/8″ or 2-3/4″ Cross Bore: 2-1/8″ Edge Bore: 7/8″ Projection: 2-3/8″ Door Thickness: 1-3/8″ – 1-3/4″ Handing: Left, Right, Reversible Product Weight: 1.55 lbs Handle Design: Siena Trim Design: Addison Latch Faceplate: Drive-in, Square Corner, Round Corner Cylinder: 5 Pin Schlage CAdditional Functions: F10-SIE-ADD: Passage Door Knob Set F40-SIE-ADD: Privacy Door Knob Set F51A-SIE-ADD (This Model): Panic Proof Keyed Entry Door Knob Set F80-SIE-ADD: Storeroom Keyed Entry Door Knob Set F170-SIE-ADD: Single Dummy Knob