Moveable Glazing System Plastic Input/Output Part

A typical movable glazing system has a couple of plastic parts.
In some types, each panel can be opened from inside. This is an input output part for the panels' horizontal movable wheels. There are holes for the screws on all 4 sides. It can be mounted on the aluminum panels input holes. I live in Turkey, it is designed according to the movable glazing system products here in Turkey.