This premium range of impaktor screwdriver bits are part of the patented tritorsion system diamond coated anti cam out screwdriver bits are specifically designed for cordless impact drivers and are suited to the heaviest duty jobs the tritorsion system means the bit and bit holder 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