Optimum bit flexibility for maximum service life at high torques. The positive fit of the bit in the screw prevents spinning and ensures a better grip. The optimised torsion zone maximises service life and torque in extreme applications. The FlexiZone reduces the load on the bit head and thus minimises the risk of bit breakage. The special FlexiZone achieves improved torque transmission to the screw and a longer service life. Application examples: Suitable for all screwdriving applications and for use in impact wrenches.