Optimum bit flexibility for maximum service life at high torques. Positive seating of the bit in the screw prevents spinning and ensures a better grip. Optimised torsion zone maximises service life and torque in extreme applications. Flexi-zone reduces the load on the bit head and therefore the risk of bit breakage. Improved torque transmission to the screw and longer service life thanks to special flexi-zone. Suitable for use in impact wrenches. Application examples: For all screwdriving applications. Suitable for use in impact wrenches.