The Neco trolley set for supported upper rail and hidden lower rail WITHOUT regulation for sliding doors is designed for the operation of two cabinet doors with a maximum weight of 50 kg. It includes the anti-derailment system, ball bearings, and flow system for a smooth opening and closing The novelty is that it is hidden from the view of the users as well as being a supported system. This set includes all the components necessary for the assembly of the carriages and skids, such as the euro threaded screws and the skid fixing clip. The packaging of this complete package contains 1 unit ready to assemble, made of steel and transparent material.