Assembling two modular aluminum profiles requires little time for processing, a limited number of tools and a familiarity that is acquired in a very short time. The nuts and bolts required by the construction system with extruded profiles are reduced to a few codes that allow modifications to be made to existing structures at any time, even on site. A service hole, a lowered cylindrical head screw, an Allen key and a rolling tap are the only necessary actors; ingenuity, imagination and the daily needs of setting up load-bearing structures or protective barriers are the driving force; the screws, special nuts and dedicated accessories are the glue of the entire modular construction system of extruded aluminum profiles.