These Extreme Impact Torsion Pozidriv Bits, made by DEWALT FLEXTORQ™ have a 15° torsion zone allowing the screwdriver bit to flex rather than break, and the full fit head prevents rounding of the screw head and 'cam out' (bit head slipping out of the screw head due to the turning force).
The DEWALT DT70587 FLEXTORQ Bit Set contains a selection of EXTREME® FlexTorq™ screwdriving bits engineered for longer life. The built-in torsion zone has been designed to absorb and control high-impact forces, transferring them into the optimised geometry of the bit tip.