Use the MX4™4-Cutter SDS MAX Rotary Hammer Drill Bit on concrete with rebar and masonry applications. Its solid carbide head has up to a 5x longer life in concrete with rebar. Rebar guards provide maximum durability in hard aggregate and rebar. Its sharp centering tips provide exact spot drilling in concrete. Integrated 4-cutter design prevents lock-up in rebar for reduced downtime. Optimized flutes remove dust faster, reducing heat and delivering up to 15% more holes per battery charge. Wear mark indicator lets you know when it no longer meets the ANSI requirement.