Drive-in post spikes hold square timber posts in a socket sleeve, most commonly sized for 70×70, 90×90 and 100×100 mm posts. Choose a spike whose sleeve matches your post so it grips tightly, and match the spike length (often 450–750 mm) to the post height and expected load.

Yes, ground screw anchors and drive-in post spikes are typically hot-dip galvanised so the buried steel resists rust in permanent ground contact. The zinc coating protects the anchor against soil moisture, making it durable for fences, decks and pergolas without needing concrete.

You install a drive-in post spike by placing it on the marked spot and hammering it vertically into the ground using a driving tool or dolly that protects the socket, checking it stays plumb as it sinks. Once the sleeve is at ground level, drop in the timber post and secure it with the clamp bolts or screws on the socket.

Ground screws and drive-in spikes work best in firm, stone-free soil where they can grip along their full length; very rocky, waterlogged or loose sandy ground may need concrete instead. The GeZu Impex range covers drive-in fence post spikes and ground-screw post anchors in galvanised steel, with each listing showing the post size and length.