Premium set of 50mm impaktor screwdriver bits diamond coated anti cam out screwdriver bits are specifically designed for cordless impact drivers and are suited to the heaviest duty jobs the bits have been precision hardened to allow the metal to flex in controlled areas and absorb the stresses applied by constant use in heavy duty impact drivers due to this hardening process the life of the screwdriver bit is dramatically improved the impaktor system is unrivalled in performance extremely