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. Extreme durability – Iron Blast Technology™ strengthens the bit. Stands up to rebar strikes – redesigned head geometry to withstand rebar strikes. No break guarantee – if your bit fails for any reason while the wear mark is still visible, we’ll replace it. 2x longer life – full carbide head in 4 cutter design. Wear mark indicator – for accurate diameter of holes.