The aerospace assembly process has always been famous to be very demanding in specialized and unique prototyped tooling. But in the recent years, the demand for standardization has grown while the aerospace drilling and assembly environment have remained as diverse as before. However some solutions exist to match those opposite requirements. It is possible to keep most flexibility required by the aerospace assembly floor and at the same time to standardize and reduce customer total cost of acquisition: this is what has been implemented through a wide product range successfully. We will illustrate through this paper how modern modular tooling design (covering namely Drills, ADU, squeezers and Battery Nutrunner) will not only strengthen aerospace assembly process but reduce total cost at the same time.