SDS-plus Pro 4 premium hammer drill, 5.5 x 115 mm. Intelligent geometry and quality down to the last detail ensure long service life, precise drill holes, and maximum smoothness even under the toughest conditions. Maximum safety is provided by optimum symmetrical head geometry with four solid carbide cutting edges, which prevents hooking in case of reinforcement hits. For diameters up to 10 mm, the innovative welded solid carbide head offers maximum service life and larger dust outlets for increased drilling speed. Power breakers create microcracks in the material for noticeably faster drilling progress. Low-vibration drilling is achieved through a four-helix variospiral design. Two large-volume spirals efficiently remove drill dust from the hole, while two reinforced spirals add extra safety and stability. The drill is extremely unbreakable due to high-quality special steel and offers a very long service life, allowing for up to 50% more circular drill holes suitable for dowels. It is designed for professional use in the hardest natural stone, concrete, and masonry.