Mail Boss 7121, Black In-Ground Mounting Post, 43 x 4 x 4 inches, for Use with Mailbox

Bought it with the Boss mailbox. Used it without any wooden post, very secure.

Very Sturdy and fits well with the mailbox!! This should last for a very long time!!

this thing is gorgeous! i had low expectations to be honest, but it's heavy duty! doesn't scratch easily, doesn't seem like a cheap powder coat, or vinyl wrap, etc. not great quality! i bought this to cover an old broken post, until i could find a big one i liked that was affordable...(they're really expensive) but tbh i think this is will be permanent. thinking of adding a small raised brick/stone flower bed at the bottom. but insanely easy to install. not shiny at all! actually looks like an expensive wood finish! highly recommend!

The gauge of the material is excellent. Since I was installing this over an existing wooden post anchored in concrete I had to shorten it a few inches. I used a disk cut off tool. It wasn’t an easy cut and have why I was impressed with the quality of the material. The installation of the mail box on the top was very easy.

This post unfortunately didn’t fit my mailbox, even though Amazon recommended it as a positive fit. But that’s on Amazon. I docked a star because it did come with the powder coating chipped off in a couple areas, possibly due to shipping, even though the box didn’t appear to be damaged. Even so, it seemed super sturdy and good quality, and the only reason I didn’t exchange for a new undamaged one was the fitment with my box I already had

Looks good and it’s sturdy.

Sturdy post, we’re in the middle of completely renovating our hardscaping and landscaping and this post worked out perfectly for the look we wanted. It seems durable. Matched our new mailbox (same brand!).

Like how you can insert a 4 x 4 wooden post to help strengthen it

Easy to install

Beau fini. Un prix vraiment fantastique au moment de mon achat

I purchased the 7121 post to support the Mail Boss 7106 mail box. The Mail Boss 7121 in-ground steel post is 4”x4” with a hollow interior that will fit snugly over a standard 3.5”x3.5” wood post (although the wood post will need to be reasonably straight). The steel post weighs 14 pounds. It is completely open at the bottom end and has a square 4 and 3/8 inch wide steel top plate securely welded over the top end of the post. The steel walls of the post are roughly 1/16” thick and quite sturdy. There are four threaded holes in the top plate that are spaced in a square that is 3 and 11/32 inches (center-to-center) apart. The four holes extend through the top plate into the hollow interior of the post (not outside of it). The mounting plate included with the Mail Boss 7106 mail box has a total of 24 3/8” holes arranged symmetrically in it, and four of these holes line up very nicely with the four threaded holes on the top plate of the 7121 steel post. The post includes four lag bolts with which to secure the mounting plate to the steel post. Strangely, though, the heads of these four lag bolts require an 11 mm wrench – a ½ inch wrench will strip the lag bolts’ drive head. It’s very strange they would use 11 mm heads and not ½ inch. One of the four sides of the post has no holes in it, but the other three sides each have two 5/16” holes, one located 1 and 3/8 inch (to the center of the hole) from the bottom of the post and the second located 4 and 3/8 inch from the bottom of the post. These holes can be used to secure the steel post to a 3.5”x3.5” wood post with six No. 10 (or ¼ inch) by 2” lag screws or the like, which are not included and must be purchased separately. I would use nothing but a zinc-coated steel lag screw (19 cents each at any Home Depot) to avoid possible corrosion due to dissimilar metals where the screw head touches the galvanized steel post when it is placed in the ground.Both the 7121 post and the 7106 mail box were completely black. When the post is set into the ground, the mounting plate is bolted onto the top plate of the post. The heads of these bolts will be inaccessible to a thief once the mail box is placed onto the mounting plate and secured to it with the two bolts described above that are accessible only by unlocking the mail door with one of the included keys. After bolting the mounting plate to the post, one slides the mail box onto the mounting plate, and then attaches them with the two screws previously mentioned. No bolt or screw can be accessed by a thief unless they open the lockable door.U.S. mail regulations require that the mail entry slot of the mail box be located between 41 and 45 inches above the road surface. The mail entry slot on this mail box is approximately 12 inches above the top plate of the steel post when the mail box is mounted on the post using the included mounting plate. Since the post is 43” long, this means that you will only be able to sink about 10 to 14 inches of the steel post into the ground if the roadway is level with the ground onto which you will mount the mail box. If you are on a residential street with a curb and you will mount the mail box into ground that is a few inches above the street surface, you may be able to sink the steel post a few inches more. But even this is probably not deep enough to securely hold the heavy mail box, even if you concrete the post all the way up to the surface. It is highly likely that you will want to use a pressure-treated wood post inside the hollow steel post to enable you to sink the post significantly deeper – particularly if you do not use concrete. In cold climates, you probably want to be at least 3 to 4 feet deep in the ground. Note also that the front face of the mail box should be between 6 and 8 inches back from the side of the road surface (close enough for the postman to reach it comfortably but not so close that he hits the mirror of his van on it).I had a handy man install my 7121 steel post (with a longer wood post inside it). He charged $150, but I gave him a little more because it was difficult to break up and remove the concrete footing from the previous mailbox post. He used an 80 pound bag of Quikrete to install my post. Installation of the mailbox on the post once it was installed was easy and quick.