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Internet # 303490318

Model # MB981B01

Store SKU # 1002858781

Store SO SKU #1002810767

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Reliant Black, Large, Steel, Locking, Post Mount Mailbox

$108.64
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  • Concealed locking compartment with delivery slot:10"W x 1.75" H
  • Durable, impact-resistant, galvanized steel construction
  • Large capacity accommodates high volume mail deliveries
  • View More Details

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Product Details

About This Product

The Reliant post mount mailbox is both a reliable and attractive choice to keep your mail secure. Engineered with heavy-duty galvanized steel, the mailbox features a concealed cam lock compartment to protect your mail. Postal carriers are able to make deliveries through the mail slot opening, which drops into the locked compartment below. The Reliant includes two keys for easy access to you and your household. For outgoing mail, letters can be fastened inside the door with the included mail clip. In addition to its security benefits, steel piano hinges and a sturdy magnetic latch keep the door functioning properly. Pre-drilled bottom mounting holes make installation a breeze. Mounting board and hardware are sold separately.

Highlights

  • Concealed locking compartment protects mail from theft and includes two mailbox keys for homeowner access to mail
  • Constructed from heavy-duty galvanized steel for extra strength and longevity
  • Delivery slot measures 10-in W x 1.75-in H
  • Outgoing mail can be fastened to mail clip inside front door (clip attachment may be required)
  • Large capacity accommodates several days of mail including magazines, padded envelopes, and small packages
  • Glossy black finish is powder-coated to withstand rust and elements
  • Fully assembled with pre-drilled holes to reduce installation time (mounting hardware sold separately)
  • Match with Gibraltar Mailboxes posts with the designation letter C
  • Magnetic latch keeps door closed when not in use
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 303490318

Model # MB981B01

Store SKU # 1002858781

Store SO SKU #1002810767

Specifications

Dimensions: H 11 in, W 10.8 in, D 22.3 in

Dimensions

Assembled Depth (in.)

22.3 in

Assembled Height (in.)

11 in

Assembled Width (in.)

10.8 in

Details

Access Type

Front Only

Assembly Required

Yes

Color

Black

Color Family

Blacks

Features

Corrosion Resistant, Decorative, Fade Resistant, Outgoing Mail Indicator

Hardware Color Family

Black

Included

Flags, Handles, Keys, Mailbox

Mailbox Capacity (cu. in.)

1450

Mailbox Size

Large

Mailbox Style

T2

Material

Galvanized Steel

Mount Type

Post Mount

Product Weight (lb.)

13.5 lb

Returnable

90-Day

Security

Locking

Warranty / Certifications

Manufacturer Warranty

90 Day Warranty

U.S. Postmaster General Approved

Yes

Questions & Answers

Does this mailbox have to be unlocked before the new mail can enter
ByJun 12, 2026
1 Answer | 
Answer This Question

Thank you for your interest in our products. No, the mailbox does not have to be unlock for mail carrier to put mail inside it. It has an open slot that the mail carrier put the mail into.

By|Jun 12, 2026


    I lost the mailbox key and I cannot find the spare what can I do?
    ByFeb 6, 2026
    1 Answer | 
    Answer This Question

    Thank you for your interest in our products. We do not have replacement keys for the Reliant mailboxes. Customer will have to drill the existing lock out. Customer can purchase our replacement lock kit model LOCKSTAM at their local Home Depot SKU # 1008876422.

    By|Feb 6, 2026


      Does the post office have a universal key which can be used to deliver larger pieces of mail that won’t fit in the slot
      ByFeb 5, 2026
      1 Answer | 
      Answer This Question

      No, the post office does not a universal key which can be used to deliver larger pieces of mail that won't fit in the slot.

      By|Feb 6, 2026


        I bought this, it arrived, locked, but no key. Is the key in a hidden spot when you open the box, or readily accessible? I returned it, and ordered another, and I hope it comes with the key.
        ByNov 10, 2024
        1 Answer | 
        Answer This Question

        Thank you for your interest in our products. The key is always tape behind the front door.

        By|Nov 13, 2024


          Is the outgoing mail clip already attached, or how does the customer attach it?Does it stay on? Produc details state some assembly may be needed..
          ByJan 3, 2024
          0 Answer | 
          Answer This Question

          Doesn't seem like Gibraltar wants to bother with answering product questions, some of which have been posted for six weeks or more! Pretty bad customer service.
          BySep 27, 2023
          1 Answer | 
          Answer This Question

          Thank you for your interest in our products. System was down. We do apologize.

          By|Nov 8, 2023


            How difficult for criminals to reach inside this mailbox and take the incoming mail.
            BySep 2, 2023
            1 Answer | 
            Answer This Question

            An average woman's hand can reach the mail through the slot. Holding it to take it out is a little difficult, tho. The slot should be smaller for security.

            By|Oct 21, 2023

              (2)

              Can this box replace an existing mailbox mounted inside a brick column? Dimensions are the same.
              ByAug 10, 2023
              1 Answer | 
              Answer This Question

              If the dimensions work, it can slide in, but the flag for outgoing needs to be placed somewhere on the column if it isn't visible outside the enclosure. If you order a separate flag it could be attached to the brick column instead.

              By|Jan 2, 2024


                Viewing 1-8 of 28

                Customer Reviews

                4 out of 5

                • 4 out of 207 reviews
                • 59% recommend this product
                Filter by:
                Showing 1-10 of 207 reviews
                The large size and locking feature make this a great choice.
                by
                • Verified Purchase
                Well glad you asked, I would hope after this review you would give me my money back. I have a picture of me sticking my hand inside mailbox while it is locked. Everyone that purchased this mailbox feels the same what a rip off. I have the picture if you would like to contact me. I feel bad because I was the person that asked the board if we could have locked mailboxes.
                by
                • Verified Purchase
                Works well with the recommended post by the company . Big enough to hold my mail securely for more than a week !
                by
                • Verified Purchase
                Strong and tough. Pleasing to the eye.
                Strong and tough. Pleasing to the eye.
                by
                • Verified Purchase
                • Recommended
                It is a nice mailbox. And it is secure from the most casual mail thief. It has worked well for a ...
                It is a nice mailbox. And it is secure from the most casual mail thief. It has worked well for a couple years now. This morning I arrive home to an open mailbox. Saturday's mail is missing. Thanks to USPS Informed Delivery email, I know all that was stolen was two junk mail pieces and my lady's Kohl's billing. The lock latch secures to the shelf in the middle of the mailbox. Alas, the gauge of the metal is not sufficient to stop a normal screwdriver from prying open the locked door. The metal just bent out, with such little required force that they did not even scratch the paint...! I was amazed how easily I was able to bend it back into place. My plan is to add a strip of 1/8" steel to the latch strip. It will require grinding off some of the lock latch, but they give me enough to make it work, I believe. If not, you sell replacement universal latches that would also work.
                by
                  • Recommended
                  7 found this review helpful
                  Practical, easy to assembly, ñuck and keys included. Good product vs price.
                  Practical, easy to assembly, ñuck and keys included. Good product vs price.
                  by
                  • Verified Purchase
                  • Recommended
                  1 found this review helpful
                  I was very disappointed after installing this product to find a flat the mail is supposed to go i...
                  I was very disappointed after installing this product to find a flat the mail is supposed to go in was quite wide and big enough that my hand would fit into a mailbox to retrieve the mail without having to unlock it the slat needs to be quite smaller very easily asked us to not very secure anyone can can fit through the opening to retrieve the mail
                  by
                  Response from Gibraltar MailboxesFeb 11, 2019
                  Thank you for taking time to leave a review. The United States Postal Service determines and issues standards that must be met for all locking and non-locking curbside mailboxes. One of these requirements is that all locking designs must have a minimum slot opening of 1.75 in. high by 10 in. wide. The Reliant mailbox has the smallest size slot allowed to meet this requirement set by the USPS. GibraltarMailboxes
                  • Verified Purchase
                  7 found this review helpful
                  Reliant/Gibraltar - Heavy Duty, Large, Locking Mailbox This mailbox is shipped inside a polyethy...
                  Reliant/Gibraltar - Heavy Duty, Large, Locking Mailbox This mailbox is shipped inside a polyethylene bag with 3/4" of closed-cell expanded polystyrene foam endcaps and packed within a cardboard box. The mailbox is constructed from a heavy gauge galvanized steel and covered with an off-white light beige powder coated finish that is very uniform and smooth. This product is also available in black. The outer door is sturdy, with a piano type hinge that runs the full width of the mailbox, with a strong magnetic latch to keep the outer door closed. The inner locking mail access door is located about 1 inch behind the outer hinged door. The inner locking door is about 5 inches tall by 9 inches wide and also as a full width piano hinge. This locking door is opened by using a small key similar to those used on office desks and filing cabinets. Two keys are provided with the box. The mail is placed through a 1.5 by 9 inch slot above the inner locking door and is large enough to accommodate a majority of mail, magazines and larger envelopes may need to be folded. The bottom of the slot has a ramp which creates a barrier to reaching deposited mail without using the key. Even though the main part of the box is locked, this design accommodates outgoing mail. The mail is clipped in front of the locking door, and behind the outer door. You can also use bar magnets to hold outgoing mail on the front or locking door. The outgoing mail notification flag is sturdy, powder coated in a gray finish and fastened with stainless fasteners. The manufacturer specifies using their "C" post kit. I prepared a mounting plate of my own, using a 1x12 #2 pine board cut down to 9-7/8" by 19-3/4". I plan to fasten the mailbox to a pressure treated wooden 4x4 post using corrosion resistant screws. This mailbox is an attractive, quality product, that should keep your mail secure for a long time.
                  by
                  • Recommended
                  6 found this review helpful
                  We decided to change out our standard rural mailbox for a locking box, as the mailbox is at a dis...
                  We decided to change out our standard rural mailbox for a locking box, as the mailbox is at a distance from the house. We chose this design because most mail can be slipped through the slot and small packages as well. It's also larger than our old box, so it can receive larger mailings without bending them. The mailbox is sturdy and heavy and all metal. It installed easily onto the recommended mounting plate which we installed on our existing mailbox post. The box comes with clear instructions and a clip that you can mount inside the box door for outgoing mail. The two keys are enough for now, but I'll likely make a few copies "just in case". Very happy with this mailbox.
                  by
                  • Recommended
                  2 found this review helpful
                  The Reliant White Locking Mount Mailbox will be the last mailbox you will ever have to buy for yo...
                  The Reliant White Locking Mount Mailbox will be the last mailbox you will ever have to buy for your Home or place Business. Reliant is Built to Last and Keeps your mail secure with a lock and key. I do not consider myself an expert in any sense of the word in any category but personally after handling hundreds and hundreds of mailboxes through the years delivering mail I choose the Reliant, it is a no brainer in comparison to any other mailboxes for its safety features as well as the quality and workmanship Approximate measurements are 21 inches long, 11 1/2 inches deep, 10 1/2 wide, the color is more of a off white then a bright white. Made of a very strong durable heavy duty galvanized steell with a nice strong well made preassembled handle that is easy to grip and matching flag that easily slides up and down as needed. Plastic mailboxes crack and handles fall off after a couple of years due to simply opening and closing, the harsh sun and rough weathers. Many tin like materials look and feel cheap and rust and the doors are removed one hinge at a time after a few years of opening and closing. The Reliant is so well made, falling apart, rusting and the door coming off will not be an issue. I assure you this is not your typical mailbox. Mail theft has become more of an issue each and ever year, your personal and important letters will be safe from theft with the Reliant Safety Lock and 2 Keys. Once your mail carrier drops your mail in your mailbox only you will be the one removing your important letters, bills and magazines. No hardware is sold with this model but the outside of the box will instruct you the size and accessories you will need to purchase for a secure, safe, lifetime of installing the last mailbox you will ever need
                  by
                  • Recommended
                  8 found this review helpful
                  Showing 1-10 of 207 reviews