---
product_id: 107006692
title: "4x4 Inches Wood Posts Base Cover Inner Size 3.5\"x3.5\", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing"
brand: "mtb"
price: "€ 31.88"
currency: EUR
in_stock: true
reviews_count: 9
url: https://www.desertcart.fr/products/107006692-4x4-inches-wood-posts-base-cover-inner-size-3-5x3
store_origin: FR
region: France
---

# 14-gauge steel Rust-resistant finish Easy installation 4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing

**Brand:** mtb
**Price:** € 31.88
**Availability:** ✅ In Stock

## Summary

> 🔧 Build with Confidence: Your Posts Deserve the Best!

## Quick Answers

- **What is this?** 4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing by mtb
- **How much does it cost?** € 31.88 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/107006692-4x4-inches-wood-posts-base-cover-inner-size-3-5x3)

## Best For

- mtb enthusiasts

## Why This Product

- Trusted mtb brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Sturdy Support:** Engineered from 14-gauge steel for unmatched durability.
- • **Easy Installation:** Designed for quick setup on existing concrete with standard wood posts.
- • **Rust-Resistant Coating:** Black powder-coat finish ensures longevity and style.
- • **Versatile Applications:** Perfect for porches, mailboxes, and garden fences.
- • **Satisfaction Guaranteed:** Order with confidence, backed by our 100% satisfaction promise.

## Overview

The Deck Post Base Post Mounting Base is a robust and versatile solution for securing 3.5x3.5 inch wooden posts. Made from durable 14-gauge steel with a rust-resistant black powder-coat finish, this post bracket is perfect for a variety of applications, including railings, mailboxes, and garden fences. Easy to install on existing concrete, it ensures your outdoor structures remain sturdy and stylish.

## Description

Black Powder Coated Metal Fence Post Base Support Bolt Down, 4x4 Inch (3.5x3.5 Inch Inner), Pack of 1 by mtb supplyinc

## Features

- Package Contents: Post anchors package includes 1 individual post holder deck bracket. Wood posts and mounting screws are not included.
- Widely Applicable: Our 4x4 concrete post anchors are suitable for 3.5 x 3.5 inch wooden columns, suitable for porch railing, post holders, mailboxes, post support bracket, etc.
- All Around Use: It can be used for decking handrails, pergolas, signs, mailboxes, garden fences,deck brackets.It would help your fences look sturdy and durable while avoiding breakages.
- Strong & Sturdy: Made from 14 gauge steel,black powder-coat for rust-resistant and sturdy enough,It allows easy installation on 4x4 wood posts on existing concrete (actual 3.6"x 3.6" dry post on market).
- 100% Satisfied Solution: Order with confidence knowing you are backed by our 100% satisfied solution.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | MTB Supply Inc |
| Part Number | GSPB3644 |
| Item Weight | 2.79 pounds |
| Product Dimensions | 4 x 4 x 1 inches |
| Item model number | GSPB3644 |
| Is Discontinued By Manufacturer | No |
| Material | Alloy Steel |
| Item Package Quantity | 1 |
| Number Of Pieces | 1, 4 |
| Measurement System | Imperial |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing - Image 1](https://m.media-amazon.com/images/I/313nzI-0mmL.jpg)
![4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing - Image 2](https://m.media-amazon.com/images/I/51pjIvbLvUL.jpg)
![4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing - Image 3](https://m.media-amazon.com/images/I/61pkppJOVUL.jpg)
![4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing - Image 4](https://m.media-amazon.com/images/I/61fynoUIQ7L.jpg)
![4x4 Inches Wood Posts Base Cover Inner Size 3.5"x3.5", 1 Pack Black Fence Post Support Square Metal Brackets Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing - Image 5](https://m.media-amazon.com/images/I/51ZmyIv4BeL.jpg)

## Available Options

This product comes in different **Scent** options.

## Questions & Answers

**Q: Do you have to shave down the 4x4 post to be able to make it fit in the anchor? Like it was in the photo.**
A: I used a new 4x4. Did not have to shave anything down. I just took the post inserted it
into the base and then tightened down on the 2 side bolts. Used it for a handrail. Holds
securely.

**Q: Will this support an 80ft long 6ft high wooden privacy fence?**
A: Good question. I think it would end up depending on what the anchor base is anchored to and how far apart you have them. If they are anchored in concrete and 8' apart - yes. If they are anchored into the earth - probably not. I also would not rely on smaller thing like paving stones or thin patio blocks as they are easily pulled up in strong wind. Good luck.

**Q: What is the width from bolt to bolt?**
A: The bolt hole centers are 4.74" apart.

**Q: will this work to secure a 4x4 aluminuim gate post?**
A: I’d be careful because lumber uses dimensional measurement, which means a 4x4 is actually 3.5x3.5. Your aluminum square tube is likely actually 3x4.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    As Advertised
  

*by S***F on Reviewed in the United States on September 27, 2023*

It was just as advertised I bought it for a mail box holder and welded a spike on the bottom which saved me some money. It was well built and sturdy size was perfect for a 4*4

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    It's a Quality product
  

*by R***L on Reviewed in the United States on October 13, 2023*

works well

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    excellent quality
  

*by W***. on Reviewed in the United States on May 2, 2023*

I needed something to hold my water hose post in place. This is an excellent product, well built, heavy and coated very well. I am going to attached the post to my deck and this fits the bill perfectly. I hope my photo and review is of help.

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**Shop now:** [https://www.desertcart.fr/products/107006692-4x4-inches-wood-posts-base-cover-inner-size-3-5x3](https://www.desertcart.fr/products/107006692-4x4-inches-wood-posts-base-cover-inner-size-3-5x3)

---

*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-27*