MX4™ 4-Cutter SDS PLUS Rotary Hammer Drill Bit is designed for use on concrete with rebar and masonry applications. Its solid carbide head has up to a 5x longer life in concrete with rebar. Engineered with rebar guards for maximum durability in hard aggregate and rebar. Sharp centering tips provide exact spot drilling in concrete and metal decking. The 4-cutter design prevents lock-up in rebar so there's less downtime. Variable flutes remove dust faster, reducing heat and delivering up to 20% more holes per battery charge. Wear mark indicator indicates when it no longer meets the ANSI requirement.