Kwikset  Polished Brass  Single Cylinder D *Finish: Polished Brass *Product Type: Single Cylinder Deadbolt *Maximum Door Thickness: 1-3/4 in. *Application: All Home Doors *Compatible Key Numbers: 0,1,2,3,4,5,6,7 *Security Grade: ANSI Grade3 *Material: Metal *Packaging Type: Clamshell *Commercial or Residential: Commercial and Residential *Backset Length: 2-3/8 in. *Pick Resistant: No *Adjustable Backset: Yes *Lifetime mechanical and finish warranty *Easily installs in minutes with just a screwdriver *Includes two keys *Deadbolt operated by key outside and thumb turn inside *For use on exterior doors where keyed entry and security is needed *One inch deadbolt throw * Model No. 660 3 *Discovery CON, NBR, SUP, EXP