Up to 50x more robust than a Bosch 2607001528 extra hard bit - do you need Torx screwdriver bits for screwing screws? Bits that last long and perform 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 torques. Their torsion zone absorbs the torque load at the tip of the bits to ensure they do not break. They feature colour-coded rings that indicate the head type and laser markings to help you choose the size you need. Impact resistant 1/4 inch hex shank for use with impact drivers and drill drivers