Privacy FunctionThe Antique Brass Door Knob Has a Privacy Function, Lock/Unlock the Door By Pushing/Pulling the Locking Button for Use on Bedroom and Bathroom Doors or Doors Requiring Privacy Adjustable LatchLatch Can Be Adjusted to 2-3/8 or 2-3/4 Inch, Fit all Doors 1-3/8 to 1-3/4 Thickness Emergency Release FunctionThere is a Emergency Release Hole on the Exterior Rosette, When Emergency Happened, the Door Can be Unlocked from the Outside by Pushing a Hex Key(Included,Come With The Product) Through the Emergency Release Hole MaterialDoor Knob Made of Heavy-Duty Zinc Alloy, Advanced Electroplating Crafted in Luxurious Antique Brass, They Look Very Shiny and Gorgeous. Add a Touch of Luxury to Your Home Complete AccessoriesThe Door Handle Contains all Accessories and Installation Instructions. If any Accessories are Missing, Please Contact Us ServiceContact Us for More or Any Questions and You Will Get a Reply Within 24 Hours. We Generally Accept any Return. It Wi