Fence Post Anchor Ground Spikes, 8 Pack, 36 In, Fits 3.5x3.5

Fence post anchor ground spikes lock 3.5" square posts firmly in place for fast, no-dig fence, railing, and mailbox installs. This 8-pack steel post stake set drives into soil for stable support while the black powder-coated finish helps resist corrosion from rain and ground contact. A burr-free design and included hardware make alignment and tightening straightforward for outdoor projects where wobble and wood rot are concerns.

• Delivers strong in-ground stability for fences, deck railings, garden posts, and mailbox posts.


• Fits 3.5" x 3.5" timber with a square socket for consistent post alignment.


• Resists rust with a black powder-coated finish designed for soil and weather exposure.


• Includes hardware to tighten the post-to-spike connection for a secure, low-wobble fit.


• Enables easy post replacement later—swap wood without replacing the ground spike.

Build straight, stable lines without digging holes or mixing concrete. These metal post anchors are designed for quick soil penetration and long-term outdoor use, giving you a clean, uniform base for wood posts while helping reduce direct ground contact that can contribute to rot. Keep a pack on hand for repairs, new sections, or multiple runs—especially when you need consistent spacing and dependable holding power. Grab yours today and get your next outdoor install moving.

• Pack size: 8 ground spikes


• Overall height: 36 in (914 mm)


• Nail length: 30 in (762 mm) ±10 mm


• Outer dimensions: 4.45 x 4.45 in (113 x 113 mm)


• Inner fit: for 3.5 x 3.5 in (89 x 89 mm) posts


• Main material: steel


• Thickness: nail board 1.7 mm; column fixing plate 1.7 mm (±0.1)


• Finish: black powder coated


• Net weight (with accessories): 29.32 lb (13.3 kg)