SDS-plus Pro 4 premium hammer drill, 5.5 x 165 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 during reinforcement hits. Up to Ø 10 mm: features an innovative, welded solid carbide head for maximum service life and larger dust outlets for the highest drilling speed. Power breakers create microcracks in the material for noticeably faster drilling progress. Low-vibration drilling is achieved with a 4-helix variospiral. Two large-volume spirals effectively remove drill dust quickly from the drill hole, while two reinforced spirals offer additional safety and stability. Extremely unbreakable due to high-quality special steel. Offers a very long service life for up to 50% more circular drill holes suitable for dowels. Designed for professional use in the hardest natural stone, concrete, and masonry.