Speed-X SDS-max® rotary hammer bits feature carbide tips that stay sharper longer and deliver more holes within specification. The compact head provides fast dust removal and longer life. The S-cutter design supplies added speed and life, while the four chiseling faces and cutting edges double the chiseling action for more efficient drilling. An active-centering tip provides quick, accurate starts, and the wear-mark indicator assures accuracy of hole diameter. These SDS-max® rotary hammer bits fit Bosch SDS-max® hammers and competitive SDS-max® drive hammers, and Hilti hammers with TE-Y/TE-FY shanks. Trust Bosch to provide professional-grade concrete accessories and tools to get the job done right.