The osteosynthesis system Screw System TX Professional enables universal use for the fixation of autologous bone cylinders, bone blocks and bone shells in the context of pre-implantation augmentation. The Torx connection ensures that the screws are securely held in the driving tool. At the same time, high tensile forces can be transmitted. A rescue screw with a larger diameter is available in the set for every screw with a core diameter of 0.9 mm, if the transplant cannot be fixed in a tension-proof manner. The small diameter as well as the flat head size of the screws make use particularly comfortable for patients and users. The Screw System TX Professional also contains screws in lengths of 13.0 mm and 16.0 mm.