The extensible rods are simply put on to the window frame. The enclosed foam selfadhesive tapes equalize the differences in thickness of the window frames. On the backside of the final there is a wedge to avoid downwords sliding of the pole.
The extensible rods are available in white and silver with a diameter of 10-12 mm. The sizes are 50 cm to 75 cm and 75 to 125 cm.