The Through-The-Wall Drop Box with Adjustable Chute by Barska has been designed to provide a secure way of remotely depositing important items such as suggestion slips, ballots, mail, documents, and more. The top slot of the drop box accepts items up to 9.6 inches in width, and can be mounted directly to a wall using the included mounting hardware. The adjustable segmented chute can be configured to fit a wall that is 2.8"-6" thick.