The Space rail clip set for screwless fixing is a huge advantage when installing rail systems for sliding doors. It is fixed on the inside of the module using screws and then the rail is snapped into the clip to hold it, They have a lot of mounting precision thanks to the studs. The mechanism is not the same for the lower rails as for the upper rails, that is why they are designed for easy identification, thus avoiding assembly failures. This kit includes the screws for installation and each piece is made of Polyamide. The packaging contains a total of 8 units.