The load-bearing structures and protective casings made with extruded profiles do not require the use of any other joint than a screw. However, in situations where greater rigidity of the couplings between the profiles or mobility between the parts of the construction system is required, the screw with a cylindrical head with a hexagon socket must be accompanied by joints, groove joints, angles in aluminum. The teams have been revisited to offer equal stiffness, smaller footprint and greater versatility than the competition. This is made possible by the hard alloy which exceeds the mechanical characteristics of that of the die-cast Al counterparts by 50%, so as to guarantee the aluminum square a point of deformation and breaking higher than the lip of the groove of the profiles themselves.