The Neco ADJUSTABLE trolley set for upper hanging rail and lower hidden rail for sliding doors is a package provided with all the necessary components for the correct movement of the doors, made of steel. Equipped with a slow system, it allows the doors to lock in smooth shape avoiding bumps and sudden movements. It also has an anti-derailment system that secures the panels against movements that may take them off course. It is used for 2 panels, 1 interior, and 1 exterior with a maximum thickness of 21 mm each. It is designed to support a total panel weight of 50 kg and these components are packaged in a single set.