Made of 1/4in. thick solid brass, this deluxe mail slot is handcrafted with the word `MAIL` cast into the exterior flap and the interior features a handsome frame (No interior 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 1-1/4in. to 1-7/8in. thick. Both the interior and exterior have a beautiful texture to them in the recessed areas.