Up to 50x more robust than a Bosch 2607001528 Extra Hard Bit. Do you need Torx screwdriver bits for driving screws? Bits that last a long time and work well in demanding applications? Then the PRO TH Impact bits are the right choice. They are designed for strength and resistance to high torque. The PRO T Impact bits are a good choice for installers looking for robust screwdriver bits for tough applications. The bits are made of heat-treated, modified steel for excellent stability and resistance to high torque. Their torsion zone absorbs the torque load at the tip of the bits to ensure they do not break. They feature colour-coded rings to indicate the head type and laser markings to help you select the size you need. Impact resistant 1/4 inch hex shank for use with impact wrenches and drill drivers.