SDS Max high-impact carbide four-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, four-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.