Antsky 4x4 Square Stainless Steel Post Base, 2-Pack

Pack: The Antsky 4x4 post base is a square stainless steel anchor bracket for standard 4x4 posts, stated as 3.5 × 3.5 inches actual size. Its air-flow channel and claimed concrete- and wood-floor fastener options suit deck, fence, mailbox, and gazebo projects.

At a glance

The stated fit is for standard 4x4 posts, with 3.5 × 3.5 inches given as the actual post size.
A bottom air-flow channel is intended to ventilate the wood-post base and reduce water accumulation.
The listing describes stainless steel with a black powder coating and includes fasteners for wood and concrete floors.

Price

$30.97Save 30%

Reference price: ~~$44.25~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

The airflow channel addresses ventilation at the point where the wooden post meets the base.
Listed fasteners cover both wood-floor and concrete-floor installation options.
The listed uses include decks, fences, mailboxes, gazebos, pergolas, and pavilions.

Technical specifications

14 specifications

Identity
Brand	Antsky

Dimensions and installation
Form factor	Square
Compatible post size	standard 4x4 posts (actual size 3.5"x 3.5")
Listed floor types	wood or concrete floors

Materials and protection
Material listed	stainless steel
Color	Black
Finish and protection claim	black powder coating which gives anti-corrosion and anti-rust protection

Design and uses
Bottom design	air flow channel
Listed applications	deck railings, fences, mailboxes, gazebos, pergolas, and pavilions

Fasteners and tools listed
Hex screws	7/32″ hex screw*16
Wood-floor screws	hex-screw for wood floor *8
Concrete sleeve bolts	sleeve bolt for concrete*8
Drill bit	drill bit *1
Hex socket tool	hex socket tool *1

What to know before buying

Listing details to confirm

The title says 2PCS, while product details list Number of Items as 1 and Unit Count as 2 Count. The feature text specifies two brackets and separate fastener quantities. Confirm the selected listing's count and included hardware before purchase. The listing also calls the finish powder-coated but does not specify the coating's thickness or a corrosion-test result.

Who is it for?

A good fit for

Projects using standard 4x4 posts for a deck railing, fence, mailbox, gazebo, pergola, or pavilion.
Installations where the buyer needs listed fastener options for either wood or concrete flooring.

Less suited to

Projects using a post size other than the stated standard 4x4 fit.
Buyers who need independently documented load capacity, coating performance, or detailed installation dimensions, which are not supplied here.

Antsky 4x4 Square Stainless Steel Post Base, 2-Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 25 ratings

5 stars83%83%
4 stars6%6%
3 stars11%11%
2 stars0%0%
1 star0%0%

Aggregate ratings lean positive, with most ratings in the five-star category and some three-star ratings. Without written feedback, these figures do not identify what buyers liked or disliked, or establish how the bracket performs. For a purchase, the stated post fit and floor-specific fasteners are more actionable than the rating pattern.

Frequently asked questions

What post size does this base fit?

The listing says it fits standard 4x4 posts and gives the actual size as 3.5 × 3.5 inches.

Can it be installed on concrete or wood?

The listing specifies wood or concrete floors and lists separate fasteners for wood-floor and concrete installation.

What is the air-flow channel for?

The manufacturer says the channel ventilates the bottom of the wood post and helps avoid water accumulation. This is a stated design intent, not a measured durability result.

How many brackets and fasteners are listed?

The feature text lists two base anchor brackets, 16 hex screws, 8 wood-floor screws, 8 concrete sleeve bolts, one drill bit, and one hex socket tool. The title and item-count details differ, so confirm the chosen listing's contents.