9446 National Pro Series. Used to allow a user to identify visitors from the security of a locked door. Glass lens. Offers 160 degrees lens angle for wide viewing. Zinc die cast body with a satin nickel finish. Requires a 5/8 inch hole and can be used in doors that measure 1-3/8 to 2 inch thick. Exterior trim width is 31/32 inch. Interior trim width is 3/4 inch. In Poly Bag.