Up to 50x more robust than a Bosch 2607001528 Extra Hard Bit. Are you looking for a compact and reliable screwdriver bit set that you can use for demanding tasks? Then the PRO Impact Set is the right choice. It includes bits that you need for various screwing jobs. The PRO Impact Set is an excellent option for installers in search of durable screwdriver bits for challenging tasks. The impact screwdriver bits are made from heat-treated, modified steel for outstanding stability and resistance to high torque. Their torsion zone absorbs the torque stress at the tip of the bits to ensure they do not break. They feature color-coded rings that indicate the head type and laser markings that help you select the required size. They are housed in a sturdy case and arranged in holders, allowing you to assemble your own tool kit. Shock-resistant 1/4-inch hex shank for use with impact drivers and drill drivers.