Up to 50 times more robust than a Bosch 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 ideal for installers seeking durable screwdriver bits for challenging tasks. The bits are made from heat-treated, modified steel for excellent 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 to help you select the required size. They are housed in a sturdy case and arranged in holders, allowing you to assemble your own toolbox. Impact-resistant 1/4-inch hex shank for use with impact wrenches and drill drivers.