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

⚫Black powder-coated finish

📏Fits 3.5x3.5 inch posts

🛠️12.5-gauge steel strength

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AR$146599

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Description

⚡ Secure your posts like a pro—durability meets effortless style!

BUILT TO LAST - Rugged 12.5-gauge steel resists cracking and rust for years of reliable use.
VERSATILE FIT - Perfectly sized for 3.5 x 3.5 inch wooden posts—ideal for decks, fences, and mailboxes.
POST PROTECTION - Separates wood from damp concrete to prevent rot and extend post lifespan.
CONFIDENCE GUARANTEED - Backed by a 100% satisfaction promise for worry-free purchasing.
EFFORTLESS INSTALLATION - U-shape design anchors directly into wet concrete—no digging or extra tools needed.

This MTB U Shape Fence Post Holder is crafted from heavy-duty 12.5-gauge steel with a sleek black powder coating to prevent rust and wear. Designed to fit 3.5 x 3.5 inch wooden posts, it anchors securely into wet concrete, protecting wood from moisture damage and ensuring long-lasting stability for decks, fences, and more. With easy installation and a satisfaction guarantee, it’s the smart choice for professional-grade post support.

Specifications

ASIN	B077QD9K97
Best Sellers Rank	#44,988 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #328 in Hardware Brackets
Customer Reviews	4.5 4.5 out of 5 stars (1,027)
Is Discontinued By Manufacturer	No
Item Weight	6.16 pounds
Item model number	GSPB3644
Manufacturer	MTB Supply Inc
Product Dimensions	4 x 4 x 1 inches

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AR$146599

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In stock

Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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