Our factory is specialize in producing door viwers, door hole's specification includes: 12mm, 14mm, 16mm, 28mm, biggest diameter includes: 38mm, 30mm, 28mm, 26mm, 16mm, available door thickness is: 20-130mm, finishes: Polish Chrome, Satin Chrome, Satin Nickel, Green Bronze, Red Bronze, Satin Brass, Titanium, Polish Brass, PVD, ORB, 24K Gold etc...We have optic glass lens, and high-definition acrylic lens for customer's options. Material for option: Brass, Zinc Alloy, Aluminum, Iron, Plastic.