National Hardware N330-712 V805 Door Viewer in Satin Nickel Authorized Replacement for Stanley Hardware Stock #N330-712 Used to allow a user to identify visitors from the security of a locked door Fits doors 1-3/8 inch to 2 inches thick Offers 160 degrees lens angle for wide viewing Requires 1/2 inch hole Includes four precision-ground glass lenses Solid brass housing Viewer adjusts to fit doors from 1-3/8-Inch to 2-1/8-Inch thick