Bosch Torx Extra Hard Screwdriver BitsBosch Torx Extra Hard Screwdriver Bits The Extra Hard Screwdriver Bit is a good choice for universal use S2 Modified Steel and an optimised heat treatment process results in extra hard quality for adequate performance The tapered torsion zone copes easily with torque peaks, fulfilling all tasks This Extra Hard Screwdriver Bit is a good choice for universal use. All tasks are achievable thanks to the bits S2 Modified Steel and an optimized heat