---
product_id: 109957026
title: "MTB 4x4 Inches Wood Posts Base Cover, Inner Size 3.5\"x3.5\", 4 Pack Fence Post Support Square Black Metal Brackets, Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing"
brand: "mtb"
price: "NT$5440"
currency: TWD
in_stock: true
reviews_count: 8
url: https://www.desertcart.tw/products/109957026-mtb-4x4-inches-wood-posts-base-cover-inner-size-3
store_origin: TW
region: Taiwan
---

# durable black powder coating fits 3.5"x3.5" wood posts 14-gauge rugged steel MTB 4x4 Inches Wood Posts Base Cover, Inner Size 3.5"x3.5", 4 Pack Fence Post Support Square Black Metal Brackets, Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing

**Brand:** mtb
**Price:** NT$5440
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your outdoor space with steel-strong style and effortless installation!

## Quick Answers

- **What is this?** MTB 4x4 Inches Wood Posts Base Cover, Inner Size 3.5"x3.5", 4 Pack Fence Post Support Square Black Metal Brackets, Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing by mtb
- **How much does it cost?** NT$5440 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/109957026-mtb-4x4-inches-wood-posts-base-cover-inner-size-3)

## 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

- • **Rock-Solid Steel Strength:** 14-gauge steel ensures long-lasting durability and resistance to wear.
- • **Sleek Black Powder Coating:** Modern matte finish that resists rust and keeps your posts looking sharp.
- • **Secure Anti-Rotation Design:** Engineered to prevent base twisting, keeping your structures stable and reliable.
- • **Versatile All-Weather Support:** Perfect for fences, decks, mailboxes, pergolas, and garden signs—boost your outdoor style.
- • **Effortless Bolt-Down Installation:** Mount directly on concrete—no digging required, saving time and hassle.

## Overview

MTB 4x4 Inches Wood Posts Base Cover is a set of four black powder-coated 14-gauge steel brackets designed to securely anchor 3.5"x3.5" wood posts on concrete surfaces. These bolt-down post bases provide superior stability without ground digging, ideal for fences, decks, mailboxes, and more, combining rugged durability with sleek aesthetics for long-lasting outdoor support.

## Description

Full description not available

## Features

- Package Contents: Post anchors package includes 4 individual post holder deck brackets. Wood posts and mounting screws are not included.
- HIGH-QUALITY MATERIAL: Made from 14 gauge rugged steel construction and durable black powder coating these supports will stay in good shape for many years to come. Worrying about your fences will no longer be a thing.
- EASY INSTALLATION: It allows easy installation on 4x4 wood posts on existing concrete. You can even install these posts brackets without inserting it into the ground.
- FENCE ANCHOR STAND: Unlike steel spikes where you need to dig the ground or use a screwed flange, this product can be easily mounted which will support your fences and provide adequate resistance to avoid base rotation.
- ALL AROUND USE: It can be used for decking handrails, pergolas, signs, mailboxes, & garden fences. It would help your fences look sturdy and durable while avoiding breakages.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | MTB Supply Inc |
| Part Number | GSPB3644 |
| Item Weight | 10.93 pounds |
| Product Dimensions | 4 x 4 x 1 inches |
| Item model number | GSPB3644 |
| Is Discontinued By Manufacturer | No |
| Color | Black |
| Material | steel |
| Item Package Quantity | 4 |
| Number Of Pieces | 4 |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![MTB 4x4 Inches Wood Posts Base Cover, Inner Size 3.5"x3.5", 4 Pack Fence Post Support Square Black Metal Brackets, Bolt Down Post Base Bracket for Anchor Fences, Mailbox, Deck Railing - Image 1](https://m.media-amazon.com/images/I/61jFjz4jWBL.jpg)

## Available Options

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

## Questions & Answers

**Q: I have some old barn beams that measure 4" x 3 3/4". Not "standard" for a 4x4 in todays lumber. What are the actual inside dimensions of the clamp?**
A: Mine had an expansion bolt to adjust to the post size.

**Q: Is the bottom inside of the base made of steel as well (to allow separation between post and concrete), or just hollow?  Can't tell from the photos.**
A: Its a whole plate on the bottom. So post would not come in contact with whatever the anchor is being held to

**Q: Can this fit lumber 4x4 pressure treated timber from home depot without shaven**
A: yes it will - you may need to trim a little, but it will fit.

**Q: Instead of drill and put anchor into the concrete, can I put the construction glue for base post patio 8 feet? is it strong stick to the post?**
A: I used anchors due to wind. Not sure glue is strong enough

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well
*by F***3 on March 15, 2024*

This product is sturdy and does what it is supposed to do. . I used them to mount 4x4 posts on a concrete deck to build a fence. Excellent product, service, and price.

### ⭐⭐⭐⭐⭐ What an incredible product this is!!!
*by A***R on July 23, 2021*

This product was PERFECT for us. It provided a very strong base o hold our 4x4's for the railings. We could not have been more pleased with this product. We used 5/16" lag bolts with washers to secure brackets to the 6x6's. It would take a pack gorillas to rip it out. In addition, I think they look GREAT! The quality of the baked on paint will last for years and years. There was another one available at Home Depot -BUT it was more than twice the cost- didn't look as good and I had to wait a week for delivery. I ordered these on Friday afternoon and they were delivered in my garage Saturday afternoon. Excellent product, service, and price.

### ⭐⭐⭐⭐⭐ Sail shade posts attached to wood deck.
*by Z***Z on June 18, 2024*

We use our deck more now that it has some shade. These post holders were a good value and worked great holding up posts for a sail shade.

## Frequently Bought Together

- Deck Post Base Post Mounting Base, Wood Post Support Black Metal Post Bracket 4x4 inch, Fit for 3.5x3.5 inch Standard Wood Post (Inner Diameter 3.5 x3.5 Inches),Pack of 4
- Fence Post Anchor Ground Spike Metal Black Powder Coated 24 x 4 x 4 Inches Outer Diameter (Inner Diameter 3.5 x3.5 Inches), Pack of 4
- YOFIT Shade Sail Hardware Kit 6 inch for Triangle Rectangle Sun Shade Sail Installation, 304 Grade Stainless for Garden Outdoors, 80 Pcs

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-03-20*