Standard impact and rotary drill bits get worn out fast. On the other hand, using hammer drills with hammer drill bits may result in inaccurate holes with chippings and broken stone slabs. We made the PRO HEX-5 to bring a solution. The drill bit has a special tip design to make sure you can drill clean holes with your impact drill – time and again. Lasts up to 2x longer than a Bosch CYL-3 Drill Bit Hex shank for a strong connection and maximum torque transmission in three-jaw chucks and ¼ internal hex tool holders For effective drilling in hard materials, eg hard stone (granite), concrete, marble, solid brick, and hollow brick, when working on light to medium-duty installation tasks, both indoors and on the outside of buildings Highly effective for professionals in various trades: Long Life