How do I attach a railing to this 4" from the bottom?

Railings run horizontal. If you are referring to a 4x4 post it just drops in and secured by screwing in from base holes. You may need a support bracket from big brand hardware store mounted to your post to support any railing mounted 4 in from base.

What is the distance between the centers of the holes in the base?

Hello The distance between the the center of the hole at the bottom of base is 1.7 inch. Thank you

What size do you drill in concrete appliction?

Hello It's 5/16 drill in concrete application. Thank you

Drill bit for concrete anchors?

Hello Drill bit for 6x6 post base is 0.4 inch. Thank you

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4x4 Post Base 4 Pcs, (Inner Size 3.6x3.6) Post Anchors, 13GA Thick Solid Steel & Black Powder Coated,Deck Post Brackets Support Deck Base Plate Pergola Brackets Fence Kit Mailbox Mount

Product ID: 489718289

Details

Brand
AXWHYS
Color
Black
Item dimensions L x W x H
5.4 x 4 x 5.6
Material
Carbon Steel
Shape
Square

📏Inner size 3.6x3.6 inches

🖤Black powder coated rustproof finish

🛠️13GA thick solid steel

€ 179.92

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Sold byAmazon AustriaDelivered 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 Austria.

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Description

🖤 Fortify your outdoor space with sleek, rustproof strength!

HEAVY DUTY STEEL STRENGTH - Crafted from 13-gauge solid steel for unmatched durability and long-lasting support.
PRECISION FIT FOR 4 X 4 POSTS - Inner dimensions of 3.6x3.6 inches ensure a snug, secure fit for standard 4x4 posts.
INNOVATIVE ROT PREVENTION DESIGN - Unique base partition and drainage holes protect wood from moisture damage, extending the life of your deck or pergola.
WEATHERPROOF BLACK POWDER COATING - Rustproof and UV-resistant finish keeps your posts looking sleek and sturdy season after season.
COMPLETE INSTALLATION KIT INCLUDED - Comes with 24 expansion anchors, 24 wood screws, 32 self-tapping screws, and a wrench for hassle-free setup.

The AXWHYS 4x4 Post Base Set includes four heavy-duty, 13-gauge solid steel brackets with a black powder-coated finish designed to resist rust and weather damage. Each base fits standard 4x4 posts (3.6x3.6 inches inner size) and features a unique partition and drainage system to prevent wood rot. The package includes all necessary screws and anchors for concrete and wood installation, ensuring a secure, long-lasting foundation for decks, pergolas, fences, and mailbox posts.

Specifications

ASIN	B0BGXT52DG
Best Sellers Rank	#4,843 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Decking Post Anchors & Bases
Brand Name	AXWHYS
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,002)
Grade Rating	Residential
Included Components	Necessary Hardware
Item Dimensions	5.4 x 4 x 5.6 inches
Item Form	Metal
Item Shape	Square
Item Type Name	Post Base
Manufacturer	AXWHYS
Material	Carbon Steel
Model Number	POST489
Number of Items	4
Part Number	POST489
Unit Count	4 Count

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€ 179.92

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

View all Trustpilot reviews