The Deco collection from Nostalgic Warehouse features the straight lines and modern look of the Art Deco trend in the 1920's and 1930's. Deco works well for a home that needs an understated look. The style has been modified slightly to fit on modern pre-drilled doors. A mortised door is usually an older door that has a longer, more narrow lock body and can be used as a passage or privacy door set. To use it as privacy, you have a skeleton key that unlocks and locks from both sides of the door. To use it as passage, you would simply not use the key or lock the door.