Milwaukee SDS-MAX MX4 2" X 18" X 23" drill bits are engineered to deliver exceptional performance and durability for heavy-duty concrete and masonry applications. Featuring solid head carbide construction, these MX4 4-Cutter SDS Max Rotary Hammer Drill Bits up to five times longer life when drilling through concrete with rebar. The innovative design includes rebar guards that enhance durability in tough aggregate and rebar environments. Milwaukee’s precision sharp centering tips ensure exact spot drilling, while the integrated 4-cutter design prevents bit lock-up in rebar, minimizing downtime and boosting productivity. Optimized flute geometry efficiently removes dust, reducing heat buildup and enabling up to 15% more holes per battery charge. Each bit also features a wear mark indicator, allowing users to easily determine when the bit no longer meets ANSI standards. These drill bits are the i choice for professionals needing reliable, long-lasting tools for concrete with rebar and masonry work. Model Number: 48-20-3993