MetaTeel
Through-the-Wall Drop Box with Adjustable Chute, Key Lock, Rainproof – through the wall mailbox
Through-the-Wall Drop Box with Adjustable Chute, Key Lock, Rainproof – through the wall mailbox
SKU:M-D9-H
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Sturdy All-Steel Construction
This mail drop box is crafted entirely from heavy-duty steel for enhanced durability and security. An ideal choice to keep your deliveries protected and your post safely contained.
Extra Spacious Drop Bin & Slot
The through-wall design features a large 15'' x 12.25'' x 6.5'' storage compartment and a roomy 12.25'' x 5'' mail slot. Perfect for accepting bulky envelopes, catalogs, phones, and items up to 2.25" thick.
Universal Adjustable Drop Chute
Designed to install in wall thicknesses from 5.5" to 10". The high-rise adjustable chute ensures smooth delivery and prevents mail jams so everything drops neatly into the bin below.
Ships from U.S. Warehouse
Tax-Exempt & PO Orders Accepted
Fast Parts Replacement
Technical Details
Features & Benefits
Secure Through-Wall Installation
Designed for through-the-wall mounting, the mailbox is installed within the wall structure with only the mail slot visible from the exterior. Mail is delivered from outside while retrieval takes place safely indoors, improving convenience, security, and weather protection without occupying interior floor space.
Integrated Rain Channel System
Built-in drainage grooves above and alongside the mail slot help redirect rainwater away from the opening before it can enter the mailbox. This additional layer of weather protection helps keep mail dry during heavy rain and harsh outdoor conditions.
Scratch-Resistant Powder-Coated Finish
Constructed from heavy-duty cold-rolled steel and finished with a durable powder coating, the mailbox resists scratches, chips, and corrosion better than conventional painted surfaces. The finish helps maintain a clean, professional appearance even after years of outdoor use.
Heavy-Duty All-Steel Construction
Built entirely from steel, including the mailbox body, access door, and lock housing, this through-wall mailbox offers superior strength compared to standard wall-mounted mailboxes. Designed to withstand daily use, impact, and outdoor exposure, the rigid steel construction helps prevent warping and provides long-lasting protection for your mail and deliveries.
Extra-Large Storage Capacity
With a spacious interior measuring 15" x 12.25" x 6.5", this mailbox accommodates far more than standard letters. Easily receive magazines, small electronics, padded envelopes, and multiple package deliveries without requiring daily retrieval. Ideal for homes, offices, and high-volume mail environments.
Adjustable Through-Wall Chute Design
The telescoping mail chute adjusts to fit wall thicknesses from 5.5" to 10", making installation compatible with most interior and exterior wall structures. The adjustable design ensures mail drops smoothly into the collection compartment, reducing the risk of items becoming stuck inside the chute.
Stainless Steel Exterior Panel
The exterior mail slot panel is constructed from genuine stainless steel for superior resistance to rain, corrosion, and long-term weather exposure. Unlike painted steel surfaces, stainless steel maintains its appearance without rusting, peeling, or requiring ongoing maintenance.
Viewing Window for Quick Mail Checks
A built-in transparent viewing window allows you to see whether mail has arrived without unlocking or opening the mailbox. This convenient feature reduces unnecessary lock usage while making it easy to monitor incoming deliveries at a glance.
Pry-Resistant Anti-Theft Baffle
An internal serrated steel security baffle helps prevent unauthorized access through the mail slot. The specially designed anti-reach barrier blocks attempts to retrieve mail or packages from the opening, providing enhanced protection against mail theft.
Video
Through-the-Wall Drop Box FAQs
The MetaTeel M-D9-H is a through-the-wall drop box that allows mail, documents, envelopes, small deliveries, and other appropriately sized items to be deposited from one side of a wall and retrieved securely from the other side.
It is designed for homes, offices, property-management locations, service businesses, schools, and other places that need a defined mail drop box or document collection point without allowing public access to the stored contents.
The adjustable through-wall chute is designed for wall thicknesses from 5.5 inches to 10 inches. This telescoping design helps the M-D9-H fit a range of suitable interior and exterior wall structures.
Before ordering, measure the finished wall thickness at the planned installation location. Also confirm that the wall cavity is clear of wiring, plumbing, HVAC components, structural elements, and other hidden obstructions.
The M-D9-H has an interior storage compartment measuring approximately 15 inches by 12.25 inches by 6.5 inches. This provides more capacity than a standard letter-only wall mail slot.
The larger storage space is intended for letters, envelopes, magazines, catalogs, padded mailers, small electronics, documents, and multiple mail deliveries that fit within the listed dimensions.
The exterior drop slot measures approximately 12.25 inches by 5 inches. The product is designed to accept bulky envelopes, catalogs, phones, and other items up to approximately 2.25 inches thick.
Before using the box for packages, checks, rent envelopes, forms, or business documents, compare the item dimensions with the slot opening and interior capacity. Oversized, rigid, or unusually shaped items may not pass through the chute smoothly.
The M-D9-H is designed for weather-exposed installation with an integrated rain-channel system. Drainage grooves above and alongside the exterior slot are designed to redirect rainwater away from the opening.
The exterior slot panel is stainless steel, and the mailbox uses a powder-coated steel body intended to resist outdoor exposure. Correct installation remains important: seal and finish the wall opening appropriately for the building and local conditions.
The drop box uses heavy-duty steel construction for the mailbox body, access door, and lock housing. The exterior mail-slot panel is stainless steel for added resistance to rain and corrosion.
The product is finished with a scratch-resistant powder coating designed to help protect the steel body from chips, scratches, and corrosion during regular outdoor use.
Yes. The MetaTeel M-D9-H through-the-wall drop box uses a key lock to control access to the collection compartment. Authorized users can retrieve delivered mail, documents, envelopes, and other deposited items from the secure side of the wall.
Keep the keys in a separate secure location and limit access to authorized household members, staff, or property managers. Check the product information before ordering to confirm the included keys and lock details.
The M-D9-H includes an internal serrated steel security baffle behind the mail slot. This anti-reach barrier is designed to make it more difficult for someone to reach through the exterior opening and remove deposited mail or items.
For best security, install the unit correctly within a suitable wall structure, keep the retrieval side inaccessible to unauthorized users, and use the lock according to the product instructions.
Yes. The M-D9-H includes a transparent viewing window that allows users to check whether mail or deliveries are inside without unlocking and opening the collection compartment.
This feature can help reduce unnecessary opening of the box while allowing homeowners, office staff, or property managers to monitor incoming deliveries more conveniently.
Yes. The M-D9-H can be used as a business mail drop box for documents, forms, envelopes, service paperwork, rent payments, and other appropriately sized items. Its through-wall design allows deposits from the public-facing side and retrieval from the secure interior side.
Before installation, confirm that the slot size, storage capacity, wall thickness, access direction, and key-control process match your business workflow. Review the item dimensions before using the box for bulky envelopes, catalogs, padded mailers, or small deliveries.
Yes. The M-D9-H is intended for letters, documents, forms, envelopes, catalogs, padded mailers, and small deliveries that fit within the 12.25-inch by 5-inch slot and are no more than approximately 2.25 inches thick.
It is not a replacement for a large parcel locker or a package room. Review the slot dimensions and interior storage capacity before selecting this product for frequent package deliveries.
Confirm the finished wall thickness is between 5.5 inches and 10 inches, then verify the planned wall opening, interior clearance, exterior slot position, and secure access to the retrieval side. Make sure the door can open fully and that staff or household members can comfortably access the compartment.
Before cutting into a wall, inspect for electrical wiring, plumbing, HVAC ducts, insulation, structural supports, and other hidden obstructions. Follow the product instructions and use appropriate installation methods for the wall material and building conditions.