Can these screw in dirt only

These are not meant for dirt. these are meant to be set in wet concrete and let dry for a permanent post mount

It'll fit just fine as long as you don't mind it overhanging an inch on each side...

Would the 4x4 one hold up fine with just one 4x4 attached exposed to wind? The only other thing attached would be roughly a 10"x10" piece of wood.

I only have 3' tall beams and used all 6", it really isn't that much more and to me, for the difference, I would use the larger Post.

what is the diameter of the spike at the bottom? I'm trying to "fix" broken original mounts...

Sorry, I didn’t measure the diameter of the spikes. My guess is 3/8 to 1/2 inch

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MTB 4"x3.5" 4PCS U Shape Fence Post Holder Black Powder Coated,Ground Spike Post Anchor Metal Concrete Post Anchor Deck Post Base

MTB 4"x3.5" 4PCS U Shape Fence Post Holder Black Powder Coated,Ground Spike Post Anchor Metal Concrete Post Anchor Deck Post Base

Product ID: 109956376

📏Fits 3.5x3.5 inch posts perfectly

🖤Black powder-coated rust resistance

🛠️12.5-gauge steel strength

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2057081₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Secure your space with style and strength!

BUILT TO LAST - Premium 12.5-gauge steel with black powder coating resists rust, cracking, and peeling for years of durability.
VERSATILE USE - Ideal for porch railings, mailbox posts, deck supports, and more—upgrade your outdoor projects with confidence.
EASY INSTALLATION - Includes 10 pre-drilled holes for quick screw mounting and steel nails for permanent concrete fixation.
U SHAPE INNOVATION - Separates wood from damp concrete to prevent rot and extend the life of your fence or deck posts.
PERFECT FIT PRECISION - Designed specifically for 3.5 x 3.5 inch wooden posts, ensuring a secure and stable hold every time.

This set of four U-shaped post anchors is crafted from durable 12.5-gauge steel with a black powder-coated finish to prevent rust and wear. Designed to fit 3.5 x 3.5 inch wooden posts, these anchors separate wood from concrete to reduce moisture damage, ensuring long-lasting stability for fences, decks, and mailboxes. Easy to install with pre-drilled holes and steel nails for concrete fixation, they offer a professional-grade solution for your outdoor structural needs.

Specifications

Best Sellers Rank	#56,543 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #486 in Hardware Brackets
Customer Reviews	4.5 out of 5 stars 1,020 Reviews

Reviews

A**R

2.09.2025

M**Q

10.09.2025

M**B

26.05.2023

T**E

18.11.2025

C**L

30.04.2023

D**G

20.02.2025

W**K

17.06.2025

P**1

27.06.2021

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3.11.2024

F**D

29.06.2024

C**O

4.08.2025

M**L

7.05.2024

A**O

9.11.2023

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2057081₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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