T&Ouml;SCH TSE-12 KURZ - Door viewer with reflective coating for doors 0.9"-1.5" (24-39 mm) Optics: 100% quality precision glass optics with viewing angle of 180 degrees Front lens: uncoated Housing: plastic Door size: 0.9"-1.5" (24-39 mm) Diameter: front nut - 1.2" (31 mm); housing - 0.6" (16 mm); rear nut - 0.8" (21 mm)