Mechanism for light-permeable, day-and-night and light-proof (blackout) roller blinds up to and including 160 cm in size, maximum fabric height - 250 cm. Made of ABS plastic. Suitable for steel, aluminum pipes with a diameter of 17 mm. Installed without drilling and with drilling. The shaft of rotation of the springs of the mechanism is lubricated to prevent heating during friction. Can be installed on the main profile art. 007..