DURABLE WEATHER-RESISTANT DESIGN: Built with a stainless steel cover, galvanized steel chute, and cold-rolled steel box, this through-wall mailbox is designed to withstand the elements. The rainproof cover keeps your mail, checks, keys, and other items safe, dry, and clean. THROUGH-WALL INSTALLATION: Designed for walls 5.5'' to 10'' thick, this wall-mounted drop box is compatible with most common wall types. Includes all necessary hardware for quick and easy installation. SECURE LOCK ANTI-FISHING MECHANISM: Equipped with a secure key lock and jagged anti-fishing panel, this deposit box ensures your items remain protected and inaccessible to unauthorized users. SPACIOUS VERSATILE STORAGE: With an exterior size of 12.25'' x 6.5'' x 15'', this drop box is perfect for holding envelopes, cash, checks, and small items. The mail slot measures 9.4'' x 2.25'' for easy deposits. RUST-RESISTANT GALVANIZED CHUTE: Featuring an adjustable galvanized steel chute (5.5'' min to 10'' max), this mailbox resists rust, making it an ideal choice for businesses, offices, and rental properties.