The system has assemblies that are provided with hooks for engaging a wire extended along longitudinal direction of a rail element (1). The back surface of rail element is extended from front end (1') along extension direction of a telescopic rail to rear end (1'') along insertion direction of telescopic rail. Several extending portions are extended in perpendicular or in parallel direction from the plane of back surface. The hooks of the assemblies are oriented relative to each other at specific distance, along opposite directions.
