T-posts are made of high quality low carbon steel, rail steel or other material steel, available in two finishes: green baked enamel paint and hot dipped galvanized post is similar to U-posts, but with a T-shaped cross-section instead. They’re easier to drive into the ground, but aren’t quite as sturdy under heavier loads.
T-posts work well for temporary, movable fencing or fences that don’t need to provide a high level of security also widely used in gardens, farms for holding fences firmly.
When it used in garden as plant trellis, lengths and number of holes can be made to order as your requirements.