SDS-plus Pro4 premium hammer drill / 20.0 x 250 mm. Intelligent geometry and quality down to the last detail for long service life, precise drill holes, and maximum smoothness even under the toughest conditions. Maximum safety due to optimum symmetrical head geometry with four solid carbide cutting edges, which do not catch in case of reinforcement hits. Up to 10 mm: with innovative, welded solid carbide head for maximum service life and larger dust outlets for maximum drilling speed. Power breakers cause microcracks in the material for noticeably faster drilling progress. Low-vibration drilling due to four-helix variospiral. Two large-volume spirals reliably remove the drill dust quickly from the drill hole, while two reinforced spirals provide additional safety and stability. Extremely unbreakable due to high-quality special steel. Very long service life for up to 50% more circular drill holes suitable for dowels. For professional use in the hardest natural stone, concrete, and masonry.