Door Viewer 180 degree with crystal lens

Door Viewer 180 degree angle of vision with 19mm Dia. Crystal Glass Lens. Standard style door viewer adds a useful security aspect to any door by enabling the user to see who is on the other side of the door before opening it. Extends to suit doors 35 - 55mm deep. Comes with a 10 year mechanical guarantee and is Fire door rated. Part of the Steelworx range in grade 304 Stainless Steel. Suitable for domestic and commercial use.