Passage Function: Passage door knob sets have no locking function and are free turning on both sides. These knobs are perfect for a hallway or closet where a lock isn't necessary. Passage knobs can also be used in conjunction with a deadbolt to secure an entrance or back door.Privacy Function: Probrico privacy door knob sets are locked from the interior with a thumb turn, unlock with a small coin hole from the outside.Privacy knobs are ideal for bathrooms, bedrooms, or anywhere a locking door is desired but a keyed cylinder isn't necessary.Specification: Backset: Adjustable to 2-3/8"; or 2-3/4";(60mm or 70mm)Door Thickness: 1-3/8"; or 1-3/4";(35mm-45mm)Handing: Left, Right, ReversibleKnob Diameter: 2.24";(57mm)Rosette Diameter: 2.56";(65mm)Easy to Install:Installation is easy, all you need is a screwdriver and a little time.This set is designed to fit standard prep doors and most installations should take less than an hour.High quality:ANSI Grade 3 certified which indicates excellent performance across a range of residential applications. This product is built from high-quality materials to give you exceptional security.Package Includes: Door knob Latch Strike plates InstallationAll needed screws