Up to 50 times more robust than a Bosch Extra Hard Bit. Do you need reliable screwdriver bits for driving screws? Bits that last long and perform well in demanding applications? Then the PRO Impact Set is the right choice. It is designed for strength and resistance to high torque. The PRO Impact Set is ideal for installers looking for durable screwdriver bits for tough jobs. The bits are made from heat-treated, modified steel for excellent stability and resistance to high torques. Their torsion zone absorbs the torque stress at the tip of the bits to ensure they do not break. The bits feature a color-coded ring that indicates the head type, as well as laser markings to assist you in selecting the required size. Impact-resistant 1/4-inch hex shank for use with impact wrenches and drill drivers.