SDS plus 2-cutter drill bits have a strong tapered core to help resist flute breaks, especially when drilling deep holes. For optimal drilling speeds, the two-stage flute design features a variable helix pattern that quickly moves debris away from the contact zone. Plus, the two sharp, carbide-cutting edges deliver clean, round holes for secure anchor installation. These bits are made in Germany and are GUARANTEED TOUGH® – so tough that we are offering a no break guarantee. If you have our bits, we have your back. Strong core – tapered core for bit strength and maximum durability, especially when drilling deep holes. Clean, round holes – two sharp cutting edges for true holes. Aggressive material removal – two stage flute design with variable helix pattern allows for efficient debris removal. Wear mark indicator – for accurate diameter of holes.