Many modern front doors require a longer than standard door viewer spy hole. This is because many front doors are now made thicker in construction than before. Older front doors tended to be no more than 50 mm thick and the standard door viewer extending to 55 mm was easy to fit. Now modern doors are made 60 to 75 mm thick, these require a extra long door viewer spy glass, capable of fiting the thicker door. In the picture above we show our long door spy glass viewer that extends to 75 mm in polished brass, we have this in polished chrome also. www,handlesupplies.ie
