A solid, heavy duty viewer cover increases your privacy. Installation is straightforward - just drill a 9/16-inch hole in your door (works for doors 1-3/8 to 2-1/6 inches thick) and screw the two pieces together. The polished chrome finish looks sleek on any door style, and the wide flanges cover any minor drilling imperfections You can easily view the entire surrounding area from the top of the head to the feet of someone standing outside. Polished Chrome 180 degree Door Viewer, 34-54mm ZAB30CP | Ironmongery Door Spy Hole Firestop Contract Door Viewer - Polished Chrome - Fire Seals Direct Solid Brass Door Viewer Suitable for 1-3/5 to 2-1/6 thick doors, simply drill a suitably positioned 1-1/10 diameter hole, insert the viewer into the hole then screw the two sides together and tighten by hand. Firestop Contract Door Viewer - Polished Chrome - Fire Seals Direct Durable Solid Brass metal with super simple installation It offers the highest quality security for you and your family.