The ideal handle shape to allow high torque transmission in difficult tightening and loosening situations. The ergonomic shape of the handle fills the palm of the hand well, the fingers lie safely in the soft rounded handle recesses. The whole hand makes contact with the handle and friction losses between the hand and the handle are avoided. With holding function (HF) to securely hold the TORX screw on the tool. Specialsurface treatment of the blades for high corrosion protection and an optimum fit in the screw head.