The Bosch PRO Impact Screwdriver Bit Set from ITS is a detailed selection of screwdriving bits for your impact drivers and drills. The PRO Impact Set is a great choice for installers who need robust, heavy-duty screwdriver bits. The bits are made from heat-treated modified steel for outstanding strength and resistance to high torque. Their torsion zone absorbs the torque stress at the bits tip to ensure they wont break. They have colour-coded rings indicating the head type and laser markings helping you pick out the size you need. They are housed in a sturdy case and arranged in holders you can use to build your own toolbox.