Made of brass, Salsbury two (2) piece deluxe mail slots (#4075) are handcrafted and have the word “MAIL” cast into the flap. Heavy duty tamper proof brass bolts secure the front and back frames to each other from the rear and accommodate solid doors and walls from 1-1/4'' through 1-7/8'' deep. Each of the castings is a 1/4'' thick and are available in three (3) popular finishes. Deluxe mail slots may be used for U.S.P.S. residential door mail delivery.