Tornado Wire - HT8/80/15 High Tensile Stock Fence 100mHT8 80 15 is the most widely used specification of high tensile stock fence. Tornado HT Stock Fence is manufactured with high tensile wire which strains tighter than mild steel and so requires fewer intermediate posts, making it quicker to erect. It does not stretch with weathering so does not need to be retightened annually. No. of Line Wires 8 Overall Height (cm) 80 Distance between stay wires (cm) 15 Top & bottom line wire specification 2. 5mm dia