The production of black annealed iron wire begins with high-carbon steel wire rods. These rods are heated and then allowed to cool in a controlled environment, a process known as annealing. This process not only improves the ductility of the wire but also reduces its hardness, making it easier to work with. The black color of the wire comes from the coating of iron oxide that forms during the manufacturing process, which provides a degree of corrosion resistance.

It's important to note that mesh size can vary depending on the intended application and desired characteristics of the wire mesh. Smaller mesh sizes offer greater structural support and security but may restrict visibility and airflow, making them suitable for fencing and containment applications. Larger mesh sizes provide enhanced visibility and airflow, making them ideal for screening, ventilation, and decorative purposes.

**Step 2: Setting Fence Posts**

Enterprising minds have risen to the challenge, developing techniques that allow for precise and controlled bending of welded wire mesh. One such method involves using specialized tools such as pliers, bending jigs, or custom-made fixtures to gradually manipulate the wire mesh into the desired shape.