DEWALT DW5808-11/16-Inch By 16-Inch By 21-1/2-Inch 4-Cutter SDS Max Rotary Hammer BitSDS Max High Impact Carbide 4 Cutter Drill Bits are manufactured with IRON BLAST TECHNOLOGY, a process that strengthens the bit to resist fatigue and results in extreme durability. The redesigned, 4 cutter carbide head offers 2X longer life and even stands up to rebar strikes. 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. Features Extreme durability: