Milwaukee 48-20-3918 5/8in x 15in x 21in MX4 4-Cutter SDS-MAX Rotary Hammer Drill BitDescription The Milwaukee 5 8in x 15in x 21in MX4 4 Cutter SDS MAX Rotary Hammer Drill Bit is built for extreme durability and high performance in concrete with rebar and masonry applications. Featuring a solid head carbide tip, it delivers up to 5X longer life in reinforced concrete. The sharp centering tip ensures accurate spot drilling, while the 4 cutter design prevents lock up when drilling through rebar, minimizing downtime. Its optimized flute