SDS 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.