Tornado Wire - C8/80/15 Stock Fence 50m/100mC8 80 15 is the most commonly used mild steel stock fence. Mild steel does not need to be strained as tightly as the high tensile variant and gradual turns can be made off intermediate posts. This is particularly useful if you need to make a lot of turns in your fence No. of Line Wires 8 Overall Height (cm) 80 Distance between stay wires (cm) 15 Top & bottom line wire specification 3mm dia 695 850 N mm2 Intermediate line wire specification 2. 5mm dia