Do you have a narrow area on your wall that requires a wall mail drop slot. Our new vertical mail slot adjusts for different wall thicknesses up to 12 inches in depth. The mail drop slot opening is just over 2.5 inches wide and just over 10.5 inches high. The chute is larger to help keep mail from not sliding through. 

https://www.takeandpop.shop/vertical-through-the-wall-mail-drop-slot/