OZ-POST MB-24 - 4" x 4" x 27" Mailbox Anchors, Fit 3-1/2" x 3-1/2" Wood Posts - Individual or Cases of 6

Product Description

OZ-Post® MB-24 Mailbox Post Anchor — 4″×4″ (Fits 3-1/2″×3-1/2″) — 27″ Length

• No-Dig Mailbox & Small-Project Anchor — Drive-in ground anchor for 4×4 wood posts; avoids digging and concrete
• Chosen by Professionals — Hot-dip galvanized steel with a black powder-coated above-grade base for long outdoor service
• Built-In Post Base — Integrated base plate gives a clean, finished look and simple fastening to the post
• ACQ-Compatible — Suitable for direct contact with modern treated lumber
• Quick Install — Drive with a manual driver or jackhammer; plumb, secure, and set your post in minutes

Make mailbox and light-duty post installs fast and tidy with the OZ-Post MB-24. The 27″ drive-in anchor grips the soil while the integrated base secures a standard 4×4 (actual 3-1/2″ square) post. The combination of hot-dip galvanizing and a black powder-coated base plate delivers contractor-grade corrosion resistance and a finished look at ground level. Common uses include mailbox posts, small signs, arbors, and similar projects where a no-dig foundation saves time.

Why Choose This

• Clean, finished appearance — Built-in base keeps posts square and looks neat at grade
• Durable build — Galvanized steel + powder coat for extended service life
• Fast & predictable — Drive-in install eliminates excavation, forms, and cure time

Specifications

Installation

Mark location and plumb line. Drive the MB-24 with a manual driver or jackhammer until the base sits at the desired grade. Check plumb as you go. Set the 4×4 post into the base and fasten through the pre-drilled holes with exterior-grade screws or carriage bolts. Verify final plumb/height and tighten hardware. (Soils with large rock content may require pre-drilling or an alternate foundation.)

Resources: Installation Instructions (PDF)  |  Manufacturer’s Warranty

Buying Guide

• Project scope: MB-24 is ideal for mailboxes and similar light-duty posts. For taller/heavier structures, consider deeper OZ-Post anchors from the T-series.
• Fasteners: Secure the post to the base with exterior screws or carriage bolts—see galvanized carriage bolts.
• Finish hardware: Stock up on corrosion-resistant bolts & fasteners to match site conditions.

Frequently Asked Questions

Do I need to pour concrete?

No. MB-24 is a no-dig, drive-in anchor designed to eliminate concrete for typical mailbox and similar installations.

What size post does it fit?

A nominal 4×4 wood post (actual 3-1/2″×3-1/2″).

How do I drive it?

Use a manual post driver or a jackhammer with an appropriate driver tool. Check plumb during installation.

Is it compatible with treated lumber?

Yes. It is suitable for contact with ACQ-treated lumber.

Will it resist corrosion?

The steel is hot-dip galvanized and the above-grade base is powder-coated to enhance corrosion resistance.

Comparison

Questions about soil conditions or which OZ-Post anchor fits your project? Contact us and we’ll help you plan a fence-contractor-grade installation that’s straight, secure, and built to last.