Armeg Impact Rated Screwdriver Bit Set features 1/4″ shank twister impact rated screwdriver bits, perfect for direct use within impact drivers. A ‘Torsion Portion’ section which is designed with a reduced diameter. The reduced diameter allows the bits to temporarily flex under high torque loads, reducing stress at the tip and protecting from damage. This results in the bits providing up to 133% increased flex over a standard bit for extreme durability.