Easy Drilling Starts - The Auto Start Pilot Drill for Diamond Holesaws provides easy drilling starts. It drills the pilot hole in tiles and guides the diamond hole saw without the use of an external centring aide. The spring-mounted centring pin with a tungsten carbide tip provides the strength necessary for drilling starts in hard materials. Use this Auto Start Pilot Drill when cutting holes through tiles. It is suitable for use with all corded and cordless drill drivers. For use with the Bosch Power Change Plus keyless arbor: offering accuracy and robustness. Features and Benefits • Easy Drilling Starts • Auto Start Pilot Drill provides easy drilling starts • Drills the pilot hole in tiles and guides the diamond hole saw without the use of an external centring aide Specifications Application materials: Hard tiles