Ca. 5cm.

It depends on how far down your piece of furniture goes. The thinnest point is 4.5 cm. In the lower part, the support has a bend to get past skirting boards. My skirting boards are 4 cm high and if I measure to the outermost point of the tube at this height, I get about 8 cm.

The support itself is approx. 4 cm. Added to this is the cable holder of approx. 0.5 cm. The 5 cm from reto.buettner is therefore a good value.

More like 8-10 cm
The upright 4cm and the TV stand about 4