It's a ground screw designed with a U-shaped bracket at the top. The screw is galvanised for corrosion resistance where a protective layer of zinc is applied to the steel surface. The length of the post is 690mm. This U-post is often used for its stability and ease of installation. They are designed to be screwed into the ground, providing a stable base for structures without the need for concrete and extensive digging. The galvanised coating helps protect the post from rust and corrosion, making it suitable for long-term outdoor use.