Check the listing for details. Door Scope/Giant Door Viewer. Condition: New. Listed at 12.95 USD. Door Viewer / Door Scope is an innovated high tech optical device that virtually replaces the conventional peep hole. When mounting this unit on any door, you will have a clear view of the outside even if standing up to seven feet away from your door. Featuring an ultra-wide viewing angle that covers bigger area versus conventional door viewers . Made out of ABS hard plastic.High-impact plastic housingRequires a 2-3/8in. holeIdeal for the doors between 1-5/8in to 2 inch in thickness.This door viewer is the best to use in a bright lit areas for both natural sunlight to artificial lighting.Both, houses or condos with plenty of room in front of the door.It also has a reverse image like in a photo cameras lenses so what is the right side - will be seen on the left!