Thickened Hard Steel: Made from thickened solid hard steel, the increased thickness significantly enhances its hardness, making the post anchor strong, durable, and resistant to deformation. Corrosion and Rust Protection: The fence post spikes are coated with a powder layer that provides strong protection against corrosion and rust. It withstands the erosion from soil and rain, while also protecting the wood from rot, greatly extending its lifespan. Fits 3.5” Wood: The square spike has a total height of 24 inches, a nail length of 18 inches, and an inner width of 3.5 inches. It is suitable for 3.5” x 3.5” square timber, providing excellent support. Complete Set: The set includes 8 Pack, meeting your daily needs and is ideal for installing and securing fences. Not only does it offer stable support, but it also provides exceptional protection, making it the top choice. Extra Secure: The post anchor ground kit comes with several nuts and screws. After inserting the spike, use these to tighten the connection between the timber and the spike, ensuring a firm fit. The timber can also be replaced after prolonged use, allowing for recycling without the need to repurchase.