The Neco trolley set for upper hung rail and lower visible rail WITHOUT regulation for sliding doors is a set of trolleys for 2 doors, 1 inner door, and 1 outer door. This set includes the anti-derailment system as well as ball bearings in their trolley. It also includes the euro threaded screws for the installation of the trolleys and the skids, as well as the clip to fix the skids and the flow system for smooth movement and closing. The maximum weight supported by this trolley system is 50 kg. Its packaging contains a set of trolleys with all the components necessary for its operation, made of resistant steel.