Brass Plated Mail Letter Slot Fits All Wood & Metal Doors 3" X 10" Inside Opening: 1-5/8" X 7-3/4" Steel Spring Loaded Flap, Meets Postal Regulations Manufactured of brass for maximum corrosion resistance Meets Postal Regulations Spring action lid seals out weather and dirt, Outside Flap Adds A touch Of Elegance To Your Home Brass Plated Finish, Matching Inside Trim Plate