T&Ouml;SCH TSL-MESSING L S - Door viewer with reflective coating for doors 2.8"-3.9" (70-100 mm) Optics: 100% quality precision glass optics with viewing angle of 200 degrees Front lens coating: reflective coating Housing: steel Door size: 2.8"-3.9" (70-100 mm) Diameter: front nut - 1.3" (33 mm); housing - 0.8" (20 mm); rear nut - 1.1" (28 mm)