MetaTeel’s M-D9-H is a steel through-the-wall drop box for offices, schools, property management, and municipal buildings that need secure after-hours drop-off of mail, payments, keys, and documents.

The adjustable mail chute fits finished walls that are 4.7 to 8 inches thick. The box features an entry opening measuring 9.34 by 2.34 inches, as well as a collection box measuring 12.28 by 14.87 by 6.4 inches. Contents are retrieved through a key-locked door on the interior side.