The Tool-co system uses the same wedge for all models of clip/base which compose the system. The big size wedge is very sturdy and so it is suitable to be used and re-used virtually forever. With large lower surface of the Tool-co levelling system, wedge exerts a strong and uniform pressure and levelling is maintained which adhesive gets set. The long upper surface finely knurled and the not-excessive angel of slope ensure a gradual and progressive insertion in the base in order to adapt optimally to the tile thickness while applying still the maximum possible pressure. For a correct and east insertion of the wedge, we recommend the special adjustable traction pliers.