Design House 741314 Cambridge Universal Latch Privacy Door Knob, Adjustable Backset, Satin Nickel Finish Finished in satin nickel and designed for left or right hand doors ANSI Grade-3 Certified for residential security; UL Listed for use on fire doors (3 Hours) Fits 2-3/4-inch and 2-3/8-inch backsets; Fits 1-3/8-inch and 1-3/4-inch thick doors Privacy Lock; locks from the inside with a turn-button and feature clearance hole on outside knob/lever to permit emergency release with a nail or like object. Comes with a limited lifetime mechanical warranty and a 5-year finish warranty