A Contemporary Mail Slot is only the decorative part for the front side of the door. It attaches with 4 small screws located under the flap.
They are available in either polished brass or antiqued brass. Click any picture below to see a big pic.
Mail Slot Measurements:
Outside Dimensions: 12.75" wide x 3" tall
Slot Opening Size: 10.75" wide x 1.75" tall