I keep referring to my industrial photography past, so I thought I would put some in for comment. This is a stand in a wire rod mill rolling 4 steel bars at once. The main output of this mill is tyre cord steel in 5mm, two tonne coils. High value stuff. About £1400 a tonne. That's why tyres cost so much. Very strong yet pliable. Then cold drawn at customers works to 0.12mm diameter for cars, 0.18 for lorries and buses.
Canon EOS 300D with 28/135 mm IS lens on tripod. 1/60 @ f5.6. ISO400. Care needed due to airborne dust and foreign bodies. One of the main problems that even the walkways vibrate. I was about 3 metres up on a steel grid walkway for this shot at the full 135mm. Quite a few show movement due to vibration. The buildings are designed to move slightly otherwise they would soon suffer fatigue fracture of columns.