Milwaukee SDS-MAX MX4 1-3/4" X 18" X 23" features the MILWAUKEE® MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bits with solid head carbide, designed to deliver up to five times longer life when drilling through concrete with rebar. These drill bits are engineered with durable rebar guards to withstand the toughest aggregate and rebar conditions. The sharp centering tips ensure precise spot drilling in concrete, while the integrated 4-cutter design prevents lock-up in rebar, minimizing downtime. Optimized flutes efficiently remove dust, reduce heat buildup, and provide up to 15% more holes per battery charge. Each bit includes a wear mark indicator to show when it no longer meets ANSI standards. I for concrete with rebar and masonry applications, these drill bits superior performance and durability. Model Number: 48-20-3992