Raiway Retrac braked trolley set for hanging sliding doors. Allows for a pleasant separation of rooms. Component materials include steel, plastic and zamak. The Raiway Retrac system offers a tight installation to a false ceiling and is designed for wooden doors over 35 mm thick. The carriages operate on ball bearings with an adjustment mechanism that remains inside the door. For installation, it is necessary to machine the doors on the upper edge. Packaging is per kit unit and includes all mechanism components, except for the track.